What’s the explanation for the shape of the Moon, Sun, all other planets, etc… in the flat earth mindset?

Parts of Santa’s narrative were adopted by colonists in New York, which blended St Nicholas and stories around Odin. Odin from Greek Mythology was known to fly around on a horse, knew who was good or bad, and at times had presents. In New York at some point, this all changed and a prior diety type figure in Odin became commercialized. The white horse became reindeer. Santa eventually adopted Coca-Cola’s colors and the commercialization and rebooting of Odin was complete. Thanks for reading.