https://en.m.wikipedia.org/wiki/Egyptian_mythology

Here ill help you with the first one since it's so difficult, but if you're interested look up these cosmologies yourself. Go to the cosmology section of that Wikipedia page (sources at the bottom).

Their cosmology describes a flat, domed earth with local sun and stars that move while the earth is fixed. It also describes space as a vast ocean.

This isn't hidden knowledge, it's common knowledge for anyone who studies these cultures.

The vikings also had a domed earth with the world tree yggdrasil holding up the sky. And if I remember right the Greeks had atlas doing the same.

https://en.m.wikipedia.org/wiki/Egyptian_mythology

Here ill help you with the first one since it's so difficult, but if you're interested look up these cosmologies yourself. Go to the cosmology section of that Wikipedia page (sources at the bottom).

Their cosmology describes a flat, domed earth with local sun and stars that move while the earth is fixed. It also describes space as a vast ocean.