How do you explain day/night cycles and seasons?
A simplified animation of the day/night cycle in FET over the course of 24 hours. Note that, in actuality, the lunar cycle is slightly slower than the solar cycle
Day and night cycles are easily explained on a flat earth. The sun moves in circles around the North Pole. When it is over your head, it's day. When it's not, it's night. The light of the sun is confined to a limited area and its light acts like a spotlight upon the earth. The picture below illustrates how the sun moves and also how seasons work on a flat earth. The apparent effect of the sun rising and setting is usually explained as a perspective effect.