The Earth is a stationary plain and the Sun is a small, optically projected object off of a mirrored dome that moves in an circular path above us. It's about 32 miles wide with an altitude of about 3,000 miles according to direct measurement with a sextant. As the Sun does its 24 hour daily cycle, throughout the year it moves closer to the central point at the north pole, then back again. This yearly cycle back and forth creates the various seasons and the changing length of day and night.