3Ecliptic Simulator
Shows how the sun's declination and right ascension change over the course of a year
فایل پیوست 4794
http://astro.unl.edu/classaction/ani.../seasonsim.swf
4Union Seasons Demonstrator
Demonstrates the changing declination of the sun with a time-lapse movie, which shows how the shadow of a building changes over the course of a year
فایل پیوست 4795
http://astro.unl.edu/classaction/ani...ansitmovie.swf