It's not just the ancients, we still have whole sections of society devoted to analysing stars and space, and are still only able to look at stars from a distance and make assumptions based on physics and chemistry.And then people wonder why the fuck the ancient people were so curious about the stars. I WONDER WHY.
So that they could figure out how to turn off those lights in the sky so that they could get some fucking rest.
And that's how roofs were invented.
Apparently, the light from the milky way is so strong here that objects actually cast shadows.