Celestial Sphere

Just a bunch of links for now.

https://www.britannica.com/science/precession-of-the-equinoxes
https://www.wikiwand.com/en/March_equinox
https://www.wikiwand.com/en/Ecliptic
T3rminatr 07:29, 17 February 2008 (UTC), Public domain, via Wikimedia Commons
https://www.wikiwand.com/en/Gregorian_calendar
https://www.wikiwand.com/en/Sidereal_time
https://beltoforion.de/en/stellarium_video/index.php
beltoforion/kalstar