https://guysmathastro.com/2026/02/02/can-a-zwo-seestar-s50-catch-an-exoplanet-transit/https://guysmathastro.com/wp-content/uploads/2026/02/image-3.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/02/image-2.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/02/image-1.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/02/image.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/01/image-8.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/01/image-7.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/01/image-6.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/01/image-5.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/01/image-4.pngimagehttps://guysmathastro.com/wp-content/uploads/2026/01/image-3.pngimage2026-02-02T16:21:45+00:00monthlyhttps://guysmathastro.com/2025/12/06/diy-spectroheliograph-by-prasad-agrahar/2025-12-06T19:41:59+00:00monthlyhttps://guysmathastro.com/2025/12/02/variable-star-measurements-with-a-seestar/2025-12-02T02:47:14+00:00monthlyhttps://guysmathastro.com/2025/11/18/yes-defocus/https://guysmathastro.com/wp-content/uploads/2025/11/image-10.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-9.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-8.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-7.pngimage2025-11-18T20:18:37+00:00monthlyhttps://guysmathastro.com/2025/11/14/still-overexposed-and-no-auroras-for-me/2025-11-14T20:42:15+00:00monthlyhttps://guysmathastro.com/2025/11/12/overexposed/https://guysmathastro.com/wp-content/uploads/2025/11/image-6.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-5.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-4.pngimage2025-11-12T14:29:32+00:00monthlyhttps://guysmathastro.com/2025/11/07/i-suck-at-astrophotography/https://guysmathastro.com/wp-content/uploads/2025/11/image-3.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-2.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image-1.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/11/image.pngimage2025-11-07T15:54:00+00:00monthlyhttps://guysmathastro.com/2025/10/14/are-we-alone-2/2025-10-14T20:23:46+00:00monthlyhttps://guysmathastro.com/2014/12/15/major-steps-in-making-a-telescope-according-to-me/2025-09-18T21:36:33+00:00monthlyhttps://guysmathastro.com/2025/09/16/are-we-alone/https://guysmathastro.com/wp-content/uploads/2025/09/image-1.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/09/image.pngimage2025-09-17T12:54:52+00:00monthlyhttps://guysmathastro.com/2025/09/13/amazing-astrophotos-by-19-year-old-venezuelan-immigrant-at-art-all-night-mt-pleasant-dc/https://guysmathastro.com/wp-content/uploads/2025/09/wvrr1656.jpgWVRR1656https://guysmathastro.com/wp-content/uploads/2025/09/tabj1371.jpgTABJ1371https://guysmathastro.com/wp-content/uploads/2025/09/nbey2987.jpgNBEY2987https://guysmathastro.com/wp-content/uploads/2025/09/ucdc8311.jpgUCDC8311https://guysmathastro.com/wp-content/uploads/2025/09/img_8496.jpgIMG_8496https://guysmathastro.com/wp-content/uploads/2025/09/ottv1360.jpgOTTV1360https://guysmathastro.com/wp-content/uploads/2025/09/kwah7736.jpgKWAH77362025-09-13T16:54:07+00:00monthlyhttps://guysmathastro.com/2025/07/04/how-to-make-a-spectroscope-cheap/2025-07-04T21:16:53+00:00monthlyhttps://guysmathastro.com/2025/01/24/some-surprises-with-new-astro-gizmos/https://guysmathastro.com/wp-content/uploads/2025/01/img_64501-1.jpgIMG_6450[1]https://guysmathastro.com/wp-content/uploads/2025/01/img_64541.jpgIMG_6454[1]https://guysmathastro.com/wp-content/uploads/2025/01/img_64501.jpgIMG_6450[1]https://guysmathastro.com/wp-content/uploads/2025/01/img_64591.jpgIMG_6459[1]https://guysmathastro.com/wp-content/uploads/2025/01/image-3.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/01/image-2.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/01/image-1.pngimagehttps://guysmathastro.com/wp-content/uploads/2025/01/image.pngimage2025-02-05T22:39:40+00:00monthlyhttps://guysmathastro.com/2024/11/02/success-with-digital-measurement-of-parabolic-telescope-mirrors/https://guysmathastro.com/wp-content/uploads/2024/11/fkesa_v2_1730508159.jpgFKESA_v2_1730508159https://guysmathastro.com/wp-content/uploads/2024/11/fkesa_v2_1730508168.jpgFKESA_v2_1730508168https://guysmathastro.com/wp-content/uploads/2024/11/fkesa_v2_1730508174.jpgFKESA_v2_1730508174https://guysmathastro.com/wp-content/uploads/2024/11/ml-test-of-rough-77-inch-roc-8-inch-d-mirror.jpgML test of rough 77 inch ROC 8 inch D mirror2024-11-02T19:28:44+00:00monthlyhttps://guysmathastro.com/2024/10/16/free-open-house-at-hopewell-observatory-in-northern-virginia-october-26-or-27/2024-10-16T16:16:38+00:00monthlyhttps://guysmathastro.com/2024/08/06/an-amazing-little-telescope/2024-08-06T18:03:42+00:00monthlyhttps://guysmathastro.com/2024/07/04/recent-photos-at-hopewell/2024-07-04T14:40:52+00:00monthlyhttps://guysmathastro.com/2024/05/03/no-night-time-golf-driving-range-or-mass-tree-cutting-in-rock-creek-park/2024-05-03T21:51:21+00:00monthlyhttps://guysmathastro.com/2023/04/15/astronomical-open-house-at-hopewell-observatory/2024-04-19T14:01:03+00:00monthlyhttps://guysmathastro.com/2024/04/03/what-if-every-person-in-the-usa-mexico-and-canada-tried-to-view-the-eclipse-monday/2024-04-03T11:34:35+00:00monthlyhttps://guysmathastro.com/2024/01/01/happy-new-year-my-presidents-corner-article-for-stardust-january-2024/2024-01-01T15:03:10+00:00monthlyhttps://guysmathastro.com/2023/06/22/a-very-stubborn-geometry-problem/https://guysmathastro.com/wp-content/uploads/2023/12/image-10.pngimage-10https://guysmathastro.com/wp-content/uploads/2023/12/image-9.pngimage-9https://guysmathastro.com/wp-content/uploads/2023/12/image-8.pngimage-8https://guysmathastro.com/wp-content/uploads/2023/12/image-7.pngimage-7https://guysmathastro.com/wp-content/uploads/2023/12/image-6.pngimage-6https://guysmathastro.com/wp-content/uploads/2023/12/image-5.pngimage-5https://guysmathastro.com/wp-content/uploads/2023/12/image-4.pngimage-4https://guysmathastro.com/wp-content/uploads/2023/06/image-61.pngimage-61https://guysmathastro.com/wp-content/uploads/2023/06/image-60.pngimage-60https://guysmathastro.com/wp-content/uploads/2023/06/image-59.pngimage-592023-12-13T14:09:48+00:00monthlyhttps://guysmathastro.com/2023/12/08/space-travel-is-impossible-stop-messing-up-our-only-planet/https://guysmathastro.com/wp-content/uploads/2023/12/image-3.pngimage-3https://guysmathastro.com/wp-content/uploads/2023/12/image-2.pngimage-2https://guysmathastro.com/wp-content/uploads/2023/12/image-1.pngimage-1https://guysmathastro.com/wp-content/uploads/2023/12/image.pngimage2023-12-09T18:55:03+00:00monthlyhttps://guysmathastro.com/2023/10/26/maskless-foucault-testing-at-last/https://guysmathastro.com/wp-content/uploads/2023/10/image-6.pngimage-6https://guysmathastro.com/wp-content/uploads/2023/10/image-5.pngimage-5https://guysmathastro.com/wp-content/uploads/2023/10/image-4.pngimage-4https://guysmathastro.com/wp-content/uploads/2023/10/image-3.pngimage-3https://guysmathastro.com/wp-content/uploads/2023/10/image-2.pngimage-2https://guysmathastro.com/wp-content/uploads/2023/10/image-1.pngimage-1https://guysmathastro.com/wp-content/uploads/2023/10/image.pngimage2023-10-26T16:51:03+00:00monthlyhttps://guysmathastro.com/2022/10/04/open-house-at-hopewell-observatory/2023-09-19T16:26:37+00:00monthlyhttps://guysmathastro.com/2023/08/15/an-apparent-paradox/https://guysmathastro.com/wp-content/uploads/2023/08/image.pngimage2023-09-06T12:11:13+00:00monthlyhttps://guysmathastro.com/2023/05/02/solved-why-do-insects-haplessly-swarm-at-night-around-lights/2023-05-02T15:01:19+00:00monthlyhttps://guysmathastro.com/2023/04/28/open-house-at-hopewell-observatory-is-canceled/https://guysmathastro.com/wp-content/uploads/2023/04/image.pngimage2023-05-21T15:16:44+00:00monthlyhttps://guysmathastro.com/2022/11/24/new-automation-with-skysafari-pro-and-onstep/https://guysmathastro.com/wp-content/uploads/2022/11/img_0353.jpgimg_03532022-11-24T00:19:38+00:00monthlyhttps://guysmathastro.com/2016/04/23/2016-hopewell-observatory-spring-open-house-and-star-party-june-45/https://guysmathastro.com/wp-content/uploads/2016/04/map-to-hopewell-june-2016.pngmap to hopewell june 20162022-09-17T16:00:06+00:00monthlyhttps://guysmathastro.com/2017/06/09/rescheduled-open-house-at-the-hopewell-observatory-saturday-june-24-2017/2022-09-17T15:49:04+00:00monthlyhttps://guysmathastro.com/2017/11/17/fall-2017-hopewell-observatory-open-house-and-star-party-november-25-26/https://guysmathastro.com/wp-content/uploads/2017/11/hopewell-map-revised.pnghopewell map revised2022-09-17T15:47:53+00:00monthlyhttps://guysmathastro.com/2022/08/12/fixing-a-dull-personal-solar-telescope/https://guysmathastro.com/wp-content/uploads/2022/08/1660269953586blob.png1660269953586blob2022-08-12T02:19:07+00:00monthlyhttps://guysmathastro.com/2022/08/12/first-light-by-joe-spencer/https://guysmathastro.com/wp-content/uploads/2022/08/img_0640.jpgimg_0640https://guysmathastro.com/wp-content/uploads/2022/08/img_0637.jpgimg_0637https://guysmathastro.com/wp-content/uploads/2022/08/img_0636.jpgimg_06362022-08-12T01:48:43+00:00monthlyhttps://guysmathastro.com/2022/07/27/the-unknown-history-of-the-telescope-by-roger-ceragioli/2022-07-27T17:24:56+00:00monthlyhttps://guysmathastro.com/2022/07/09/hopewells-ealing-mount-is-working-again-after-8-months/2022-07-09T20:26:40+00:00monthlyhttps://guysmathastro.com/2022/06/02/progress-with-onstep-re-build-of-ealing-mount/https://guysmathastro.com/wp-content/uploads/2022/06/67563995238__c2763679-215c-4c13-b746-8b19f4d06b04.jpg67563995238__c2763679-215c-4c13-b746-8b19f4d06b04https://guysmathastro.com/wp-content/uploads/2022/06/67563944382__1434a940-7d6e-4245-b3a5-a58ec49a1af2.jpg67563944382__1434a940-7d6e-4245-b3a5-a58ec49a1af22022-06-02T21:56:01+00:00monthlyhttps://guysmathastro.com/2022/05/05/our-onstep-re-build-is-at-last-working/2022-05-08T16:38:42+00:00monthlyhttps://guysmathastro.com/2022/05/01/problem-perhaps-solved/2022-05-02T02:18:28+00:00monthlyhttps://guysmathastro.com/2022/04/30/oscilloscope-testing-of-onstep-system/2022-04-30T16:21:35+00:00monthlyhttps://guysmathastro.com/2022/04/21/birds-and-city-lighting-a-toxic-mix/2022-04-21T20:24:18+00:00monthlyhttps://guysmathastro.com/2022/04/16/mysterious-onstep-behavior/2022-04-16T02:36:24+00:00monthlyhttps://guysmathastro.com/2022/02/17/more-onstep-progress-in-re-building-the-ealing-telescope-drive-at-the-hopewell-observatory/2022-02-17T02:52:44+00:00monthlyhttps://guysmathastro.com/2022/01/03/first-time-installation-of-onstep-board-with-nema23-stepper-motors-in-ealing-mount-at-hopewell/2022-01-17T18:07:41+00:00monthlyhttps://guysmathastro.com/2021/12/31/progress-and-problems-with-an-onstep-conversion-of-a-high-quality-1970s-telescope-drive/2022-01-17T17:51:15+00:00monthlyhttps://guysmathastro.com/2021/12/21/actual-progress-with-onstep/2021-12-21T04:05:22+00:00monthlyhttps://guysmathastro.com/2021/12/18/mysterious-noises-from-stepper-motors-for-the-ealing-telescope-mount/2021-12-20T01:16:13+00:00monthlyhttps://guysmathastro.com/2021/12/19/its-not-rust-its-just-grease/2021-12-19T18:04:03+00:00monthlyhttps://guysmathastro.com/2021/10/24/a-navigation-geometry-problem/2021-10-24T19:37:58+00:00monthlyhttps://guysmathastro.com/2021/10/13/correct-weight-of-the-mystery-glass/2021-11-27T22:34:06+00:00monthlyhttps://guysmathastro.com/2021/09/29/satisfying-fixes-made-to-50-year-old-electro-mechanical-telescope-drive-at-hopewell-observatory/2021-09-30T00:03:20+00:00monthlyhttps://guysmathastro.com/2021/09/29/disturbing-racist-clauses-found-in-early-nca-constitutions-bylaws/2021-09-29T02:09:05+00:00monthlyhttps://guysmathastro.com/2021/09/15/first-telescope-making-class-since-march-of-2020/2021-09-15T02:32:26+00:00monthlyhttps://guysmathastro.com/2021/08/29/a-piece-of-mystery-glass/2021-10-12T13:21:30+00:00monthlyhttps://guysmathastro.com/2021/07/20/is-this-question-reasonable/https://guysmathastro.com/wp-content/uploads/2021/07/desmos-graph.pngdesmos-graphhttps://guysmathastro.com/wp-content/uploads/2021/07/sample-qiuestion-from-international-baccalaureat.jpgsample qiuestion from International Baccalaureat2021-07-20T19:44:02+00:00monthlyhttps://guysmathastro.com/2021/06/08/why-there-are-no-space-faring-civilizations-and-never-will-be/https://guysmathastro.com/wp-content/uploads/2021/06/7815c-1mmh1ewicnvj50vi-cstsdg.png1*mMH1eWIcnVJ50vI-csTsdghttps://guysmathastro.com/wp-content/uploads/2021/06/6096b-1uyq9sla2xcoredh6ht-9xw.png1*UYq9sla2xCorEDh6ht-9xwhttps://guysmathastro.com/wp-content/uploads/2021/06/9bc12-10uf7rdjl_reqwicwcewnng.jpeg1*0UF7rDJL_REQwICwcewnNg2021-06-08T17:08:35+00:00monthlyhttps://guysmathastro.com/2021/05/18/final-silvering-results-with-angel-guard/2021-06-05T13:21:21+00:00monthlyhttps://guysmathastro.com/2021/05/11/silvering-a-mirror-vs-aluminizing/2021-11-29T02:54:14+00:00monthlyhttps://guysmathastro.com/2021/03/02/a-mental-math-trick/2021-03-02T00:45:06+00:00monthlyhttps://guysmathastro.com/2019/09/20/12-inch-ealing-made-ritchey-chretien-telescope-for-sale/https://guysmathastro.com/wp-content/uploads/2019/09/img_8233-1.jpgIMG_8233https://guysmathastro.com/wp-content/uploads/2019/09/img_8230.jpgIMG_8230https://guysmathastro.com/wp-content/uploads/2019/09/img_0711.jpgIMG_0711https://guysmathastro.com/wp-content/uploads/2019/09/img_0700.jpgIMG_0700https://guysmathastro.com/wp-content/uploads/2019/09/img_8233.jpgIMG_8233https://guysmathastro.com/wp-content/uploads/2019/09/img_8226.jpgIMG_8226https://guysmathastro.com/wp-content/uploads/2019/09/img_8160.jpgIMG_8160https://guysmathastro.com/wp-content/uploads/2019/09/img_8153.jpgIMG_8153https://guysmathastro.com/wp-content/uploads/2019/09/img_8151.jpgIMG_8151https://guysmathastro.com/wp-content/uploads/2019/09/img_0703.jpgIMG_07032021-01-16T01:19:32+00:00monthlyhttps://guysmathastro.com/2020/10/05/antique-6-f-14-refractor-with-good-optics-available/2020-12-24T15:01:27+00:00monthlyhttps://guysmathastro.com/2020/12/24/clay-davies-links-for-telescope-makers/2020-12-24T01:09:09+00:00monthlyhttps://guysmathastro.com/2020/12/18/easy-ways-to-show-the-earth-is-not-flat/2020-12-18T01:16:00+00:00monthlyhttps://guysmathastro.com/2020/09/02/some-ww2-or-cold-war-era-aerial-surveillance-cameras/https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-036.jpghopewell jan 2013 036https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-035.jpghopewell jan 2013 035https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-034.jpghopewell jan 2013 034https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-033.jpghopewell jan 2013 033https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-032.jpghopewell jan 2013 032https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-031.jpghopewell jan 2013 031https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-030.jpghopewell jan 2013 030https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-029.jpghopewell jan 2013 029https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-028.jpghopewell jan 2013 028https://guysmathastro.com/wp-content/uploads/2020/09/hopewell-jan-2013-027.jpghopewell jan 2013 0272023-05-20T19:48:58+00:00monthlyhttps://guysmathastro.com/2020/08/30/can-mathematicians-be-replaced-by-computers/2020-08-30T21:30:32+00:00monthlyhttps://guysmathastro.com/2020/03/11/logs-and-plagues/2020-08-13T21:54:22+00:00monthlyhttps://guysmathastro.com/2020/03/04/recommended-books-on-math/2020-03-04T20:56:03+00:00monthlyhttps://guysmathastro.com/2020/02/13/a-neat-geometry-lesson-and-a-rant/2020-02-13T20:14:45+00:00monthlyhttps://guysmathastro.com/2020/01/19/in-which-some-of-the-advantages-of-traditional-dobsonian-telescopes-are-demonstrated/https://guysmathastro.com/wp-content/uploads/2020/01/img_5932.jpgimg_5932https://guysmathastro.com/wp-content/uploads/2020/01/img_5933.jpgimg_59332020-01-25T16:22:36+00:00monthlyhttps://guysmathastro.com/2020/01/03/mining-at-the-observatory-sort-of/https://guysmathastro.com/wp-content/uploads/2020/01/img_5853.jpgIMG_5853You are looking up towards the majority of the columnhttps://guysmathastro.com/wp-content/uploads/2020/01/img_5852.jpgIMG_5852https://guysmathastro.com/wp-content/uploads/2020/01/img_5851.jpgIMG_5851https://guysmathastro.com/wp-content/uploads/2020/01/img_5850.jpgIMG_5850https://guysmathastro.com/wp-content/uploads/2020/01/img_5849.jpgIMG_5849https://guysmathastro.com/wp-content/uploads/2020/01/img_5848.jpgIMG_5848https://guysmathastro.com/wp-content/uploads/2020/01/img_5847.jpgIMG_5847How I left it: two solid blocks and some plywood in case our cribbing and jacks give way2020-01-03T02:32:16+00:00monthlyhttps://guysmathastro.com/2019/12/30/more-about-spray-coating-astronomical-mirrors-with-silver/2019-12-30T01:56:23+00:00monthlyhttps://guysmathastro.com/2019/12/08/james-tanton-what-is-k-12-math/2019-12-08T14:31:41+00:00monthlyhttps://guysmathastro.com/2019/11/21/some-gifs-animations-that-demonstrate-deep-mathematical-truths/2019-11-21T01:31:07+00:00monthlyhttps://guysmathastro.com/2015/08/25/directions-to-open-house-at-hopewell-observatory-on-september-19-20-2015/https://guysmathastro.com/wp-content/uploads/2015/08/map-to-hopewell-oct-2019.jpgmap to hopewell oct 2019https://guysmathastro.com/wp-content/uploads/2015/08/map-to-hopewell-oct-2014-1.jpgmap to hopewell oct 2014https://guysmathastro.com/wp-content/uploads/2015/08/map-to-hopewell-oct-2014.jpgmap to hopewell oct 20142022-07-08T00:38:39+00:00monthlyhttps://guysmathastro.com/2019/09/23/problems-solved-with-the-old-6-refractor/https://guysmathastro.com/wp-content/uploads/2019/09/img_5241.jpgIMG_5241https://guysmathastro.com/wp-content/uploads/2019/09/img_5239.jpgIMG_5239https://guysmathastro.com/wp-content/uploads/2019/09/img_5233.jpgIMG_5233https://guysmathastro.com/wp-content/uploads/2019/09/img_5200.jpgIMG_5200https://guysmathastro.com/wp-content/uploads/2019/09/img_5197.jpgIMG_5197https://guysmathastro.com/wp-content/uploads/2019/09/img_5310.jpgIMG_53102019-10-11T03:44:03+00:00monthlyhttps://guysmathastro.com/2019/09/22/trying-to-figure-out-problems-with-a-century-old-refractor/https://guysmathastro.com/wp-content/uploads/2019/09/img_5304.jpgIMG_5304The empty lens cell. Note that they didn't make it blackhttps://guysmathastro.com/wp-content/uploads/2019/09/img_5303.jpgIMG_5303The original chips on the second lens elementhttps://guysmathastro.com/wp-content/uploads/2019/09/img_5301.jpgIMG_5301The two lenses together; note the multiple, small black tape spacers between the pieces of glasshttps://guysmathastro.com/wp-content/uploads/2019/09/img_5300.jpgIMG_5300The cardboard spacers around the edgeshttps://guysmathastro.com/wp-content/uploads/2019/09/img_5296.jpgIMG_5296Me looking puzzledhttps://guysmathastro.com/wp-content/uploads/2019/09/img_5293.jpgIMG_5293You can see the black tape and tan cardboard spacershttps://guysmathastro.com/wp-content/uploads/2019/09/img_5291.jpgIMG_5291Note that the retaining ring holding the front of the first lens merely slides into the cell; it’s held in place by four screws. The threading is on the inside of the ring, and the outside is smoothhttps://guysmathastro.com/wp-content/uploads/2019/09/img_5290.jpgIMG_5290Gently tapping off the lens cell from the tube2019-09-22T23:16:05+00:00monthlyhttps://guysmathastro.com/2019/09/06/a-weekend-at-almost-heaven/https://guysmathastro.com/wp-content/uploads/2019/09/img_5176.jpgIMG_5176The lottery drawing for a whole bunch of neat prizes. None of us 3 won anything.https://guysmathastro.com/wp-content/uploads/2019/09/img_5174.jpgIMG_5174Left to right: Mike Laugherty, Oscar Olmedo, mehttps://guysmathastro.com/wp-content/uploads/2019/09/img_5172.jpgIMG_5172Mike Laugherty and me fiddling with binocular mounthttps://guysmathastro.com/wp-content/uploads/2019/09/img_5167-1.jpgIMG_5167 (1)Me fiddling with the parallelogram binocular mount in the daytimehttps://guysmathastro.com/wp-content/uploads/2019/09/img_5165-1.jpgIMG_5165 (1)Me fiddling with my 12.5" home-made dob in the daytimehttps://guysmathastro.com/wp-content/uploads/2019/09/img_5164-1.jpgIMG_5164 (1)Mike Laugherty and mehttps://guysmathastro.com/wp-content/uploads/2019/09/img_5163-1.jpgIMG_5163 (1)Mike Laugherty and mehttps://guysmathastro.com/wp-content/uploads/2019/09/img_5162-1.jpgIMG_5162 (1)Oscar Olmedo and me at our campsitehttps://guysmathastro.com/wp-content/uploads/2019/09/img_5161-1.jpgIMG_5161 (1)Me studying my charts, in front of parallelogram binocular mounthttps://guysmathastro.com/wp-content/uploads/2019/09/img_5141.jpgIMG_5141Alan Goldberg teaching someone how to use a sextant2019-09-06T16:23:46+00:00monthlyhttps://guysmathastro.com/2019/08/18/cleaning-up-a-century-old-refractor/https://guysmathastro.com/wp-content/uploads/2019/08/img_5061.jpgIMG_5061https://guysmathastro.com/wp-content/uploads/2019/08/img_5060.jpgIMG_5060https://guysmathastro.com/wp-content/uploads/2019/08/img_5027.jpgIMG_5027https://guysmathastro.com/wp-content/uploads/2019/08/img_5059.jpgIMG_5059https://guysmathastro.com/wp-content/uploads/2019/08/ghcw2253.jpgGHCW2253https://guysmathastro.com/wp-content/uploads/2019/08/img_5044.jpgIMG_5044https://guysmathastro.com/wp-content/uploads/2019/08/img_5043.jpgIMG_50432019-08-21T21:03:37+00:00monthlyhttps://guysmathastro.com/2019/08/06/bath-interferometer-at-stellafane/https://guysmathastro.com/wp-content/uploads/2019/08/img_4962.jpgIMG_4962https://guysmathastro.com/wp-content/uploads/2019/08/img_4961.jpgIMG_4961https://guysmathastro.com/wp-content/uploads/2019/08/img_4959.jpgIMG_4959https://guysmathastro.com/wp-content/uploads/2019/08/img_4958.jpgIMG_4958https://guysmathastro.com/wp-content/uploads/2019/08/img_4955.jpgIMG_4955https://guysmathastro.com/wp-content/uploads/2019/08/img_4952.jpgIMG_49522019-08-06T17:07:17+00:00monthlyhttps://guysmathastro.com/2019/08/05/silvering-mirrors-and-more-at-stellafane/https://guysmathastro.com/wp-content/uploads/2019/08/img_4987.jpgIMG_4987https://guysmathastro.com/wp-content/uploads/2019/08/img_4985.jpgIMG_4985https://guysmathastro.com/wp-content/uploads/2019/08/img_4972.jpgIMG_49722019-08-06T16:48:12+00:00monthlyhttps://guysmathastro.com/2019/08/03/stellafane-2019-so-far/2019-08-03T14:44:58+00:00monthlyhttps://guysmathastro.com/2019/06/29/commercial-sites-for-astronomy-viewing-near-new-mexico/2019-06-29T16:24:04+00:00monthlyhttps://guysmathastro.com/2019/06/04/one-billionaire-is-changing-what-humanity-can-see-at-night/2019-06-04T15:56:06+00:00monthlyhttps://guysmathastro.com/2019/06/03/the-other-major-problem-with-tfa/2019-06-03T19:48:59+00:00monthlyhttps://guysmathastro.com/2019/05/22/a-light-weight-mirror-cover-for-tight-quarters/https://guysmathastro.com/wp-content/uploads/2019/05/img_4447.jpgimg_4447https://guysmathastro.com/wp-content/uploads/2019/05/img_4452.jpgimg_4452https://guysmathastro.com/wp-content/uploads/2019/05/img_4448.jpgimg_4448https://guysmathastro.com/wp-content/uploads/2019/05/img_4449.jpgimg_44492019-05-22T19:42:27+00:00monthlyhttps://guysmathastro.com/2019/01/04/fixing-basic-flaws-in-photosynthesis-a-good-idea-or-worse-than-frankensteins-monster/2019-01-04T19:13:44+00:00monthlyhttps://guysmathastro.com/2019/01/03/videos-on-telescope-making-from-gordon-waite/2019-01-03T03:50:50+00:00monthlyhttps://guysmathastro.com/2018/11/17/first-light-on-an-8-scope-and-1-4-lambda-on-a-6-mirror-all-in-one-night/https://guysmathastro.com/wp-content/uploads/2018/11/img_2079.jpgimg_20792018-11-17T03:35:34+00:00monthlyhttps://guysmathastro.com/2018/11/10/some-progress-at-last-with-figuring-the-16-5-f-4-5-thin-mirror-that-headlines-this-blog/https://guysmathastro.com/wp-content/uploads/2018/11/bolsters-ritchey-like-machine.jpgbolster's ritchey-like machinehttps://guysmathastro.com/wp-content/uploads/2018/11/perfect-theoretical-ronchigrams-for-guys-42-cm-mirror.jpgperfect theoretical ronchigrams for guy's 42 cm mirror2018-11-10T20:07:50+00:00monthlyhttps://guysmathastro.com/2018/11/04/major-moving-day-at-hopewell-observatory/https://guysmathastro.com/wp-content/uploads/2018/11/img_1945.jpgIMG_1945https://guysmathastro.com/wp-content/uploads/2018/11/img_1941.jpgIMG_1941https://guysmathastro.com/wp-content/uploads/2018/11/img_1938.jpgIMG_1938https://guysmathastro.com/wp-content/uploads/2018/11/img_1935.jpgIMG_1935https://guysmathastro.com/wp-content/uploads/2018/11/img_1922.jpgIMG_1922https://guysmathastro.com/wp-content/uploads/2018/11/img_1915.jpgIMG_1915https://guysmathastro.com/wp-content/uploads/2018/11/img_1912.jpgIMG_1912https://guysmathastro.com/wp-content/uploads/2018/11/img_1911.jpgIMG_1911https://guysmathastro.com/wp-content/uploads/2018/11/img_1909.jpgIMG_19092018-11-04T22:50:40+00:00monthlyhttps://guysmathastro.com/2018/10/16/why-not-show-students-the-beauty-of-mathk/https://guysmathastro.com/wp-content/uploads/2018/10/img_1735.pngIMG_1735https://guysmathastro.com/wp-content/uploads/2018/10/img_1734-1.pngimg_1734-1https://guysmathastro.com/wp-content/uploads/2018/10/img_1739.pngimg_1739https://guysmathastro.com/wp-content/uploads/2018/10/img_1734.pngimg_1734https://guysmathastro.com/wp-content/uploads/2018/10/img_1733.pngimg_17332018-10-16T17:06:26+00:00monthlyhttps://guysmathastro.com/2018/10/13/national-geographic-on-telescope-making/2018-10-13T13:09:02+00:00monthlyhttps://guysmathastro.com/2018/09/09/how-thick-are-the-coatings-on-the-mirrors-we-aluminize/https://guysmathastro.com/wp-content/uploads/2018/09/imaginary-sphere-for-aluminization.pngimaginary sphere for aluminizationhttps://guysmathastro.com/wp-content/uploads/2018/09/170901_ext__0157_seu.jpg170901_ext__0157_SE(U)https://guysmathastro.com/wp-content/uploads/2018/09/170901_ext__0156_seu.jpg170901_ext__0156_SE(U)https://guysmathastro.com/wp-content/uploads/2018/09/032.jpg032https://guysmathastro.com/wp-content/uploads/2018/09/img_0064.jpgIMG_0064https://guysmathastro.com/wp-content/uploads/2018/09/img_0072.jpgIMG_0072https://guysmathastro.com/wp-content/uploads/2018/09/img_0071.jpgIMG_0071https://guysmathastro.com/wp-content/uploads/2018/09/img_0070.jpgIMG_0070https://guysmathastro.com/wp-content/uploads/2018/09/img_0069.jpgIMG_0069https://guysmathastro.com/wp-content/uploads/2018/09/atm-003.jpgatm 0032018-09-09T20:32:05+00:00monthlyhttps://guysmathastro.com/2018/09/08/difficulties-in-using-the-matching-ronchi-test-on-a-12-cassegrain-mirror/https://guysmathastro.com/wp-content/uploads/2018/09/matching-ronchi-for-12-inch-cass.pngmatching ronchi for 12 inch casshttps://guysmathastro.com/wp-content/uploads/2018/09/img_13371.jpgIMG_1337https://guysmathastro.com/wp-content/uploads/2018/09/ideal-ronchigram-12-inch-cass-ealing.pngideal ronchigram 12 inch cass ealinghttps://guysmathastro.com/wp-content/uploads/2018/09/img_1337.jpgIMG_1337https://guysmathastro.com/wp-content/uploads/2018/09/matching-ronchi-test-12-in-cass.pngmatching ronchi test 12 in cass2020-08-13T22:24:14+00:00monthlyhttps://guysmathastro.com/2018/09/07/latest-ronchi-or-knife-edge-tester-for-mirrors-and-other-optics-using-a-webcam/https://guysmathastro.com/wp-content/uploads/2018/09/img_1335.jpgIMG_13352018-09-07T00:57:32+00:00monthlyhttps://guysmathastro.com/2018/08/30/observe-the-stars-at-lake-artemisia-natural-area-september-30/https://guysmathastro.com/wp-content/uploads/2018/08/lake-artemesia-2.jpglake artemesia 2https://guysmathastro.com/wp-content/uploads/2018/08/lake-artemisia-best.jpgLake Artemisia best2018-08-30T02:17:10+00:00monthlyhttps://guysmathastro.com/2018/08/27/math-how-come-we-forget-so-much-of-what-we-learned-in-school/2018-08-27T20:35:06+00:00monthlyhttps://guysmathastro.com/2014/12/14/part-1-of-leon-foucaults-1859-article-on-making-telescopes-with-silvered-and-parabolized-glass-mirrors/https://guysmathastro.com/wp-content/uploads/2014/12/guy-16-inch-2.jpgguy 16 inch 22018-08-14T18:55:17+00:00monthlyhttps://guysmathastro.com/2014/12/16/one-way-to-build-an-alt-az-newtonian-telescope/https://guysmathastro.com/wp-content/uploads/2014/12/cell-holder-variant-by-jcn.pngcell holder variant by JCNhttps://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-8.pngmake a dob pic 8https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-7.pngmake a dob pic 7https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-6.pngmake a dob pic 6https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-5.pngmake a dob pic 5https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-4.pngMake a dob pic 4https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-3.pngmake a dob pic 3https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-2.pngmake a dob pic 2https://guysmathastro.com/wp-content/uploads/2014/12/make-a-dob-pic-1.pngmake a dob pic 12018-08-14T18:31:20+00:00monthlyhttps://guysmathastro.com/2014/12/16/build-your-telescope-tube-and-mount/2018-08-14T18:29:00+00:00monthlyhttps://guysmathastro.com/2014/12/16/aluminization/https://guysmathastro.com/wp-content/uploads/2014/12/essential-atm-steps-aluminizer.pngessential atm steps aluminizer2018-08-14T02:04:00+00:00monthlyhttps://guysmathastro.com/2014/12/15/rough-grinding-of-a-telescope-mirror/https://guysmathastro.com/wp-content/uploads/2014/12/essential-atm-steps-grinding.pngessential atm steps grindinghttps://guysmathastro.com/wp-content/uploads/2014/12/essential-atm-steps-calculate-sagitta.pngessential atm steps calculate sagitta2018-08-14T01:08:10+00:00monthlyhttps://guysmathastro.com/2014/12/15/fine-and-intermediate-grinding-of-your-mirror/2018-08-14T01:07:17+00:00monthlyhttps://guysmathastro.com/2014/12/15/polishing-your-mirror/2018-08-14T01:05:55+00:00monthlyhttps://guysmathastro.com/2014/12/16/figuring-parabolizing-your-mirror/2018-08-14T01:05:01+00:00monthlyhttps://guysmathastro.com/2018/05/25/why-math/2018-05-25T19:57:27+00:00monthlyhttps://guysmathastro.com/2018/05/19/prasads-home-grown-drive-controller/https://guysmathastro.com/wp-content/uploads/2018/05/img_0525-1.jpgIMG_0525 (1)https://guysmathastro.com/wp-content/uploads/2018/05/img_0523-1.jpgIMG_0523 (1)https://guysmathastro.com/wp-content/uploads/2018/05/img_0522.jpgIMG_0522https://guysmathastro.com/wp-content/uploads/2018/05/img_0521-1.jpgIMG_0521 (1)2018-05-19T20:18:38+00:00monthlyhttps://guysmathastro.com/2018/03/27/quantifying-progress-in-the-fight-against-turned-down-edge/https://guysmathastro.com/wp-content/uploads/2018/03/guys-16-perfect.pngguys 16 perfecthttps://guysmathastro.com/wp-content/uploads/2018/03/quantify-tde.pngquantify TDE2018-03-27T19:18:33+00:00monthlyhttps://guysmathastro.com/2018/03/05/what-a-great-night/https://guysmathastro.com/wp-content/uploads/2018/03/img_9762.jpgIMG_9762https://guysmathastro.com/wp-content/uploads/2018/03/img_9761.jpgIMG_97612018-03-05T07:37:54+00:00monthlyhttps://guysmathastro.com/2018/03/02/no-atm-class-tonight-march-2-2018/2018-03-02T17:55:29+00:00monthlyhttps://guysmathastro.com/2018/01/31/a-6-dob-for-young-relatives/https://guysmathastro.com/wp-content/uploads/2018/01/design-artsy-astro-cutouts.pngdesign artsy astro cutoutshttps://guysmathastro.com/wp-content/uploads/2018/01/img_9416.jpgIMG_9416https://guysmathastro.com/wp-content/uploads/2018/01/new-type-of-secondary-holder.pngnew type of secondary holder2018-01-31T17:42:31+00:00monthlyhttps://guysmathastro.com/2018/01/21/under-corrected-commercial-mirrors/2018-01-24T21:24:09+00:00monthlyhttps://guysmathastro.com/2018/01/18/make-your-own-telescope/2018-01-18T17:08:40+00:00monthlyhttps://guysmathastro.com/2018/01/15/is-this-a-sketch-of-the-evolution-of-galaxies-over-time/https://guysmathastro.com/wp-content/uploads/2018/01/img_9336.jpgimg_9336https://guysmathastro.com/wp-content/uploads/2018/01/img_9335.jpgimg_9335https://guysmathastro.com/wp-content/uploads/2018/01/img_9334.jpgimg_9334https://guysmathastro.com/wp-content/uploads/2018/01/img_9333.jpgimg_9333https://guysmathastro.com/wp-content/uploads/2018/01/img_9332.jpgimg_93322018-01-15T23:03:35+00:00monthlyhttps://guysmathastro.com/2018/01/14/photos-from-chabot/2018-01-14T23:49:30+00:00monthlyhttps://guysmathastro.com/2018/01/14/a-bit-of-weight-saving-astro-whimsy-on-a-scope-for-my-great-nephews/https://guysmathastro.com/wp-content/uploads/2018/01/img_9314.jpgimg_9314https://guysmathastro.com/wp-content/uploads/2018/01/img_9337.jpgimg_9337https://guysmathastro.com/wp-content/uploads/2018/01/img_9339.jpgimg_9339https://guysmathastro.com/wp-content/uploads/2018/01/img_9342.jpgimg_93422018-01-14T00:25:40+00:00monthlyhttps://guysmathastro.com/2018/01/10/a-visit-to-oaklands-chabot-science-and-amateur-telescope-making-class/https://guysmathastro.com/wp-content/uploads/2018/01/img_9105.jpgIMG_9105https://guysmathastro.com/wp-content/uploads/2018/01/img_9104.jpgIMG_9104https://guysmathastro.com/wp-content/uploads/2018/01/img_9102.jpgIMG_9102https://guysmathastro.com/wp-content/uploads/2018/01/img_9101.jpgIMG_9101https://guysmathastro.com/wp-content/uploads/2018/01/img_9099.jpgIMG_9099https://guysmathastro.com/wp-content/uploads/2018/01/img_9110.jpgIMG_9110https://guysmathastro.com/wp-content/uploads/2018/01/img_9111.jpgIMG_9111https://guysmathastro.com/wp-content/uploads/2018/01/img_9097.jpgIMG_9097https://guysmathastro.com/wp-content/uploads/2018/01/img_9096.jpgIMG_90962018-01-11T20:38:07+00:00monthlyhttps://guysmathastro.com/2017/11/27/australian-tv-bit-on-me-and-the-dc-atm-workshop/2017-11-27T15:23:03+00:00monthlyhttps://guysmathastro.com/2017/10/08/calculations-with-a-curious-cassegrain/https://guysmathastro.com/wp-content/uploads/2017/10/cass-equations1.pngcass equationshttps://guysmathastro.com/wp-content/uploads/2017/10/cass-equations.pngcass equations2017-10-08T03:27:39+00:00monthlyhttps://guysmathastro.com/2017/09/09/a-recent-image-of-m-13-the-great-hercules-globular-cluster/https://guysmathastro.com/wp-content/uploads/2017/09/m13-as-png-file-from-hopewell-labor-day-2017.pngm13 as png file from hopewell labor day 20172017-09-09T20:24:34+00:00monthlyhttps://guysmathastro.com/2017/09/07/trying-to-test-a-50-year-old-cassegran-telescope/https://guysmathastro.com/wp-content/uploads/2017/09/hindle-sphere-test.pnghindle sphere testhttps://guysmathastro.com/wp-content/uploads/2017/09/img_8224.jpgIMG_8224https://guysmathastro.com/wp-content/uploads/2017/09/img_8210.jpgIMG_8210https://guysmathastro.com/wp-content/uploads/2017/09/img_8207.jpgIMG_8207https://guysmathastro.com/wp-content/uploads/2017/09/my-graph-of-12-inch-cass-readings.pngmy graph of 12 inch cass readingshttps://guysmathastro.com/wp-content/uploads/2017/09/figure-xp-on-the-12-inch-cass.pngfigure xp on the 12 inch cass2017-09-07T23:58:31+00:00monthlyhttps://guysmathastro.com/2017/09/04/magic-in-the-night-air/2017-09-04T06:29:06+00:00monthlyhttps://guysmathastro.com/2017/08/29/the-eclipse-in-an-image-made-by-an-expert-the-first-one-that-sort-of-matches-what-the-eye-could-see/2017-08-29T14:26:42+00:00monthlyhttps://guysmathastro.com/2017/08/28/a-whole-bunch-of-pix-combined-with-great-skill-hardware-and-software-equals-what-i-saw-during-totality/2017-08-28T17:06:10+00:00monthlyhttps://guysmathastro.com/2017/08/27/an-eclipse-seen-in-wyoming/https://guysmathastro.com/wp-content/uploads/2017/08/img_8141.jpgIMG_8141https://guysmathastro.com/wp-content/uploads/2017/08/img_8140.jpgIMG_8140https://guysmathastro.com/wp-content/uploads/2017/08/img_8138.jpgIMG_8138https://guysmathastro.com/wp-content/uploads/2017/08/img_8130.jpgIMG_8130https://guysmathastro.com/wp-content/uploads/2017/08/img_8120.jpgIMG_8120https://guysmathastro.com/wp-content/uploads/2017/08/img_8118.jpgIMG_8118https://guysmathastro.com/wp-content/uploads/2017/08/img_8114.jpgIMG_8114https://guysmathastro.com/wp-content/uploads/2017/08/img_8108.jpgIMG_8108https://guysmathastro.com/wp-content/uploads/2017/08/img_8105.jpgIMG_8105https://guysmathastro.com/wp-content/uploads/2017/08/img_8099.jpgIMG_80992017-08-27T05:25:01+00:00monthlyhttps://guysmathastro.com/2017/08/21/almost-ready-for-the-eclipse/2017-08-21T00:19:36+00:00monthlyhttps://guysmathastro.com/2017/08/14/safer-table-saws-should-be-mandatory/https://guysmathastro.com/wp-content/uploads/2017/08/img_6366.jpgIMG_6366https://guysmathastro.com/wp-content/uploads/2017/08/img_6365.jpgIMG_63652019-08-22T01:01:07+00:00monthlyhttps://guysmathastro.com/2017/08/08/im-featured-in-an-npr-wamu-piece-on-eclipse-chasers/https://guysmathastro.com/wp-content/uploads/2017/08/img_7996.jpgimg_7996https://guysmathastro.com/wp-content/uploads/2017/08/img_7871.jpgimg_7871https://guysmathastro.com/wp-content/uploads/2017/08/img_7995.jpgimg_7995https://guysmathastro.com/wp-content/uploads/2017/08/img_7878.jpgimg_7878https://guysmathastro.com/wp-content/uploads/2017/08/img_7879.jpgimg_78792017-08-08T13:06:18+00:00monthlyhttps://guysmathastro.com/2017/07/15/only-15-types-of-plane-tiling-convex-pentagons-exist/https://guysmathastro.com/wp-content/uploads/2017/07/a-tessellation-with-pentagons.pnga tessellation with pentagons2017-07-15T03:25:16+00:00monthlyhttps://guysmathastro.com/2017/07/14/american-science-and-the-1878-eclipse/2017-07-14T14:00:28+00:00monthlyhttps://guysmathastro.com/2017/07/04/is-this-a-fractal-or-a-fibonacci-spiral/https://guysmathastro.com/wp-content/uploads/2017/07/img_7669.jpgimg_76692017-07-04T00:22:40+00:00monthlyhttps://guysmathastro.com/2017/06/23/actual-images-of-various-rovers-on-mars-as-well-as-aftermaths-of-unfortunate-crashes/2017-06-23T19:31:56+00:00monthlyhttps://guysmathastro.com/2017/05/07/easy-way-to-do-calculus/https://guysmathastro.com/wp-content/uploads/2017/05/img_7398.jpgimg_73982017-05-07T19:02:14+00:00monthlyhttps://guysmathastro.com/2017/04/29/two-simultaneous-first-lights-at-the-nca-cccc-telescope-making-workshop/https://guysmathastro.com/wp-content/uploads/2017/04/img_7246.jpgIMG_7246https://guysmathastro.com/wp-content/uploads/2017/04/img_7245.jpgIMG_72452017-05-02T03:22:10+00:00monthlyhttps://guysmathastro.com/2017/04/20/a-six-inch-f3-hand-made-scope/https://guysmathastro.com/wp-content/uploads/2017/04/img_7067.jpgimg_7067https://guysmathastro.com/wp-content/uploads/2017/04/img_7065.jpgimg_7065https://guysmathastro.com/wp-content/uploads/2017/04/img_7069.jpgimg_70692017-04-20T21:33:25+00:00monthlyhttps://guysmathastro.com/2017/04/14/religions-based-on-well-myths-or-alternative-facts-or-lies/2017-04-14T17:57:23+00:00monthlyhttps://guysmathastro.com/2017/04/06/how-britain-became-an-island/https://guysmathastro.com/wp-content/uploads/2017/04/gupta_ncomms-16-16909a_fig2_rev2.pngGupta_NCOMMS-16-16909A_Fig2_rev22017-04-06T13:16:04+00:00monthlyhttps://guysmathastro.com/2017/02/24/the-mathematics-of-george-washington/https://guysmathastro.com/wp-content/uploads/2017/02/george-washingtons-protractor1.pnggeorge-washingtons-protractorhttps://guysmathastro.com/wp-content/uploads/2017/02/george-washingtons-protractor.pnggeorge-washingtons-protractor2017-02-28T06:04:18+00:00monthlyhttps://guysmathastro.com/2016/12/12/telescope-fix-scudding-clouds-over-moon-tom-turkeys-hiding-and-successful-cloud-chamber/https://guysmathastro.com/wp-content/uploads/2016/12/img_6169.jpgimg_61692016-12-12T23:40:46+00:00monthlyhttps://guysmathastro.com/2016/09/16/a-talk-at-ahsp-on-telescope-making/https://guysmathastro.com/wp-content/uploads/2016/09/dumbbell-processed-november-1-2015.pngdumbbell-processed-november-1-2015https://guysmathastro.com/wp-content/uploads/2016/09/img_0198.jpgimg_01982016-09-16T04:18:23+00:00monthlyhttps://guysmathastro.com/2016/09/16/different-ways-to-teach-math/2016-09-16T03:38:52+00:00monthlyhttps://guysmathastro.com/2016/09/01/sex-and-math-the-zero-to-two-percent-of-our-actual-lives-that-rules-our-lives/2016-09-01T15:41:00+00:00monthlyhttps://guysmathastro.com/2016/06/29/when-was-the-last-time-you-spent-a-night-under-the-stars/https://guysmathastro.com/wp-content/uploads/2016/06/showa13.jpgshowA13https://guysmathastro.com/wp-content/uploads/2016/06/picture-of-hopewell.jpgpicture of hopewell2016-06-29T18:29:46+00:00monthlyhttps://guysmathastro.com/2016/06/20/any-moth-experts-out-there/https://guysmathastro.com/wp-content/uploads/2016/06/img_5001.jpgIMG_5001https://guysmathastro.com/wp-content/uploads/2016/06/img_4996.jpgIMG_49962016-06-20T23:51:56+00:00monthlyhttps://guysmathastro.com/2016/05/19/movie-about-ramanujan/2016-05-19T15:14:41+00:00monthlyhttps://guysmathastro.com/2016/04/26/evolution-is-slow/2016-04-28T15:59:20+00:00monthlyhttps://guysmathastro.com/2016/04/25/some-sights-at-or-near-hopewell-observatory/https://guysmathastro.com/wp-content/uploads/2016/04/img_4544.jpgIMG_4544https://guysmathastro.com/wp-content/uploads/2016/04/img_4540.jpgIMG_4540https://guysmathastro.com/wp-content/uploads/2016/04/img_4537.jpgIMG_4537https://guysmathastro.com/wp-content/uploads/2016/04/img_4536.jpgIMG_4536https://guysmathastro.com/wp-content/uploads/2016/04/img_4535.jpgIMG_4535https://guysmathastro.com/wp-content/uploads/2016/04/img_4533.jpgIMG_4533https://guysmathastro.com/wp-content/uploads/2016/04/img_4532.jpgIMG_45322016-04-25T16:03:26+00:00monthlyhttps://guysmathastro.com/2016/03/15/hitherto-un-noticed-properties-of-primes/2016-03-15T16:12:41+00:00monthlyhttps://guysmathastro.com/2016/03/15/a-maker-faire-in-reston-va/https://guysmathastro.com/wp-content/uploads/2016/03/img_4323.jpgIMG_4323https://guysmathastro.com/wp-content/uploads/2016/03/img_4321.jpgIMG_4321https://guysmathastro.com/wp-content/uploads/2016/03/img_4319.jpgIMG_4319https://guysmathastro.com/wp-content/uploads/2016/03/img_4318.jpgIMG_4318https://guysmathastro.com/wp-content/uploads/2016/03/img_4317.jpgIMG_43172016-03-15T01:20:57+00:00monthlyhttps://guysmathastro.com/2016/03/11/another-recent-scope-at-the-nca-atm-workshop-at-the-cccc/https://guysmathastro.com/wp-content/uploads/2016/03/thumbscrews.pngthumbscrewshttps://guysmathastro.com/wp-content/uploads/2016/03/003.jpg003https://guysmathastro.com/wp-content/uploads/2016/03/machine-screw.pngmachine screwBegin with a machine screw (bolt)https://guysmathastro.com/wp-content/uploads/2016/03/machine-screw-3.pngmachine screw - 3Drill and tap (i.e., thread) the little hole; attach to vane; feed the far end through a hole in the wall of the tube; attach securely with a washer and nut.https://guysmathastro.com/wp-content/uploads/2016/03/machine-screw-2.pngmachine screw - 2Cut off the head, use a grinder or saw to make a flat area (or else you can split the screw down the middle)https://guysmathastro.com/wp-content/uploads/2016/03/img_4106.jpgIMG_4106https://guysmathastro.com/wp-content/uploads/2016/03/img_4104.jpgIMG_41042016-03-11T20:53:34+00:00monthlyhttps://guysmathastro.com/2016/03/07/some-student-made-telescopes/https://guysmathastro.com/wp-content/uploads/2016/03/galilelan-and-keplerian-telescope.pnggalilelan and keplerian telescopehttps://guysmathastro.com/wp-content/uploads/2016/03/img_4269.jpgIMG_4269https://guysmathastro.com/wp-content/uploads/2016/03/img_4128.jpgIMG_41282016-03-07T22:44:26+00:00monthlyhttps://guysmathastro.com/2016/03/07/the-worlds-blackest-material/2016-03-07T18:26:43+00:00monthlyhttps://guysmathastro.com/2016/03/07/possible-youve-been-noticed-card-to-give-to-science-fair-participants/2016-03-07T16:38:04+00:00monthlyhttps://guysmathastro.com/2016/03/05/one-way-to-make-a-telescope-spider/https://guysmathastro.com/wp-content/uploads/2016/03/ramonas-spider-4.pngramonas spider 4https://guysmathastro.com/wp-content/uploads/2016/03/ramonas-spider-3.pngramonas spider 3https://guysmathastro.com/wp-content/uploads/2016/03/ramonas-spider-2.pngramonas spider 2https://guysmathastro.com/wp-content/uploads/2016/03/ramonas-spider-1.pngramonas spider 12016-03-06T12:43:54+00:00monthlyhttps://guysmathastro.com/2016/02/27/a-recently-completed-telescope/https://guysmathastro.com/wp-content/uploads/2016/02/img_4183.jpgIMG_4183https://guysmathastro.com/wp-content/uploads/2016/02/steves-scope-6.pngsteve's scope 6https://guysmathastro.com/wp-content/uploads/2016/02/steve-suranovics-scope-5.pngsteve suranovic's scope 5https://guysmathastro.com/wp-content/uploads/2016/02/img_4184.jpgIMG_4184https://guysmathastro.com/wp-content/uploads/2016/02/img_4178.jpgIMG_4178https://guysmathastro.com/wp-content/uploads/2016/02/img_4179.jpgIMG_4179https://guysmathastro.com/wp-content/uploads/2016/02/img_4177.jpgIMG_41772016-02-27T14:05:59+00:00monthlyhttps://guysmathastro.com/2016/01/23/shoveling-snow/2016-01-23T18:19:40+00:00monthlyhttps://guysmathastro.com/2015/12/04/telescope-making-in-cuba/2015-12-05T21:09:16+00:00monthlyhttps://guysmathastro.com/2015/11/18/another-puzzle-an-f3-very-thin-pyrex-mirror-that-seems-to-have-a-plastic-layer-on-top-of-the-glass/https://guysmathastro.com/wp-content/uploads/2015/11/img_3682.jpgIMG_3682https://guysmathastro.com/wp-content/uploads/2015/11/img_3679.jpgIMG_3679https://guysmathastro.com/wp-content/uploads/2015/11/img_3680.jpgIMG_36802015-11-18T20:21:33+00:00monthlyhttps://guysmathastro.com/2015/11/14/puzzlement-when-trying-to-figure-a-convex-surface-through-the-back/https://guysmathastro.com/wp-content/uploads/2015/11/img_3668.jpgIMG_3668https://guysmathastro.com/wp-content/uploads/2015/11/img_3667.jpgIMG_3667https://guysmathastro.com/wp-content/uploads/2015/11/img_3665.jpgIMG_3665https://guysmathastro.com/wp-content/uploads/2015/11/img_3663.jpgIMG_3663https://guysmathastro.com/wp-content/uploads/2015/11/img_3660.jpgIMG_3660https://guysmathastro.com/wp-content/uploads/2015/11/img_3656.jpgIMG_36562015-11-14T15:11:43+00:00monthlyhttps://guysmathastro.com/2015/08/18/some-photos-from-almost-heaven-star-party/https://guysmathastro.com/wp-content/uploads/2015/08/029.jpg029Here I demonstrate how light and insubstantial are the famous Seneca Rocks that I passed on the way back from the star party.https://guysmathastro.com/wp-content/uploads/2015/08/027.jpg027One of the many excellent talks. In this one, Jan Wisniewski (Vish - NYEV-ski) is showing how to make an IR on-axis autoguider.https://guysmathastro.com/wp-content/uploads/2015/08/023.jpg023A friend's minimalist, ultra-light dobsonian telescope, either 18 or 20 inch diameter. Note the lack of mirror box!https://guysmathastro.com/wp-content/uploads/2015/08/016.jpg016This is the Durbin Rocket railroad - a small and slow coal-burning locomotive designed to carry heavy loads of lumber. If you sit behind the engine, you WILL be coated with coal dust and cinders.https://guysmathastro.com/wp-content/uploads/2015/08/014.jpg014Me and my 12.5" truss-tube dob that I built,https://guysmathastro.com/wp-content/uploads/2015/08/012.jpg012Beautiful but slightly threatening clouds the first night ended up dissipating. We had three beautiful nights of observing!https://guysmathastro.com/wp-content/uploads/2015/08/006.jpg006https://guysmathastro.com/wp-content/uploads/2015/08/005.jpg005Baling hay in fields right next to TMI / AHSPhttps://guysmathastro.com/wp-content/uploads/2015/08/001.jpg001Part of the road up to TMI and AHSP2015-08-18T17:52:58+00:00monthlyhttps://guysmathastro.com/2015/08/18/great-long-weekend-of-observing-near-spruce-knob-wva-at-11th-almost-heaven-star-party/2015-08-18T17:33:36+00:00monthlyhttps://guysmathastro.com/2015/07/14/pluto-with-a-huge-crater-that-may-have-bashed-it-out-of-round/https://guysmathastro.com/wp-content/uploads/2015/07/pluto-w-large-crater.jpgpluto w large crater2015-07-15T00:46:07+00:00monthlyhttps://guysmathastro.com/2015/04/20/felling-some-trees-at-hopewell-observatory-so-we-can-view-polaris-again/https://guysmathastro.com/wp-content/uploads/2015/04/003.jpg003https://guysmathastro.com/wp-content/uploads/2015/04/005.jpg005https://guysmathastro.com/wp-content/uploads/2015/04/006.jpg006https://guysmathastro.com/wp-content/uploads/2015/04/007.jpg007https://guysmathastro.com/wp-content/uploads/2015/04/008.jpg0082015-04-20T00:00:07+00:00monthlyhttps://guysmathastro.com/2015/03/25/where-i-disagree-with-francis-s-collins/2015-03-25T03:07:35+00:00monthlyhttps://guysmathastro.com/2015/03/25/a-good-night-at-the-dc-nca-cccc-telescope-making-workshop/2015-03-25T02:40:21+00:00monthlyhttps://guysmathastro.com/2015/02/16/here-is-a-treasury-of-talks-by-neal-degrasse-tyson/https://guysmathastro.com/wp-content/uploads/2015/02/neal-d-tyson-science-talks.pngneal d tyson science talks2015-02-16T21:35:03+00:00monthlyhttps://guysmathastro.com/2015/02/13/adventures-in-making-a-glass-surface-optically-flat/https://guysmathastro.com/wp-content/uploads/2015/02/flats-i-guess-001.jpgflats i guess 001https://guysmathastro.com/wp-content/uploads/2015/02/001.jpg001https://guysmathastro.com/wp-content/uploads/2015/02/010.jpg010https://guysmathastro.com/wp-content/uploads/2015/02/009.jpg009https://guysmathastro.com/wp-content/uploads/2015/02/008.jpg008https://guysmathastro.com/wp-content/uploads/2015/02/006.jpg006https://guysmathastro.com/wp-content/uploads/2015/02/022.jpg0222015-02-13T20:43:04+00:00monthlyhttps://guysmathastro.com/2015/01/08/the-original-memoire-by-foucault-in-french-which-i-apparently-was-the-first-to-translated-into/2015-02-05T01:10:34+00:00monthlyhttps://guysmathastro.com/2015/01/09/doh-and-duh-12-inches-in-a-foot-my-previous-tables-were-all-wrong/https://guysmathastro.com/wp-content/uploads/2015/01/corrected-min-distances-for-star-test.jpgcorrected min distances for star test2015-01-09T20:10:55+00:00monthlyhttps://guysmathastro.com/2015/01/09/bad-news-on-star-testing/https://guysmathastro.com/wp-content/uploads/2015/01/min-distances-for-star-test.jpgmin distances for star test2015-01-09T19:21:13+00:00monthlyhttps://guysmathastro.com/2015/01/09/introducing-another-telescope-making-blog/2015-01-09T00:38:38+00:00monthlyhttps://guysmathastro.com/2015/01/04/on-making-an-artificial-star-for-an-indoor-star-tester/https://guysmathastro.com/wp-content/uploads/2015/01/ctheta-times-radius.pngc=theta times Radiushttps://guysmathastro.com/wp-content/uploads/2015/01/angle-arc-radius.pngangle arc radiushttps://guysmathastro.com/wp-content/uploads/2015/01/star-size-of-artificial-rig.pngStar Size of artificial righttps://guysmathastro.com/wp-content/uploads/2015/01/artificial-star-setup.pngartificial star setuphttps://guysmathastro.com/wp-content/uploads/2015/01/resolution-in-arc-seconds.pngresolution in arc secondshttps://guysmathastro.com/wp-content/uploads/2015/01/resolution-of-lens-or-mirror.pngresolution of lens or mirror2015-06-08T17:47:54+00:00monthlyhttps://guysmathastro.com/2014/12/15/part-6-of-leon-foucaults-article/2014-12-15T01:05:27+00:00monthlyhttps://guysmathastro.com/2014/12/15/part-5-of-leon-foucaults-article/2014-12-15T01:02:31+00:00monthlyhttps://guysmathastro.com/2014/12/15/part-four-of-leon-foucaults-article/2014-12-15T00:52:38+00:00monthlyhttps://guysmathastro.com/2014/12/15/part-3-of-leon-foucaults-article/2014-12-15T00:47:39+00:00monthlyhttps://guysmathastro.com/2014/12/14/part-2-of-leon-foucaults-article/2014-12-14T22:20:49+00:00monthlyhttps://guysmathastro.com/about/2014-10-08T03:15:48+00:00weekly0.6https://guysmathastro.comdaily1.02026-02-02T16:21:45+00:00