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Astrolabes and other Sky Instruments

Jo Hunter's presentation about Astrolabes and other instruments used to study the sky, before we had telescopes, clocks and other modern devices. The first half deals with Lunar Volvelles, Sundials and Nocturnals, followed by the history of the Astrolabe, before delving into how to use the Astrolabe in the second half. Filmed at the Riverside Nature Center, Kerrville, TX on 17th September 2024. https://riversidenaturecenter.org For written instructions for all the instruments, please visit http://wavytail.com To purchase your own astrolabe, sundial, nocturnal or lunar volvelle, please visit http://wavytail.etsy.com Chapter/topic listing: 00:00 - Introduction 05:40 - Lunar Volvelles 08:11 - Sundials 10:42 - Nocturnals 12:56 - Astrolabe introduction/history 22:13 - Astrolabe parts & markings 33:37 - Finding sunrise/sunset 39:36 - Finding star rise & set 41:48 - Finding current time 44:48 - Use as a Planisphere 49:39 - Right Ascension & Declination 51:51 - Adding objects to the Rete 53:41 - Southern Hemisphere astrolabes 55:51 - Universal astrolabes (Saphea Arzachelis) 57:55 - Quadrants 58:59 - Useful websites and apps 1:00:38 - Questions 1:05:15 - One More Thing https://mysolartime.com/ - double check your solar time https://apps.apple.com/us/app/solar-t... - solar time for iPhone https://theskylive.com/ - gives you positions of all sky objects https://www.ngdc.noaa.gov/geomag/calc... - web app that shows both true north and magnetic north Captions of off-camera questions/comments are approximate; I did my best!