They are the most easily spotted things in the sky. We once thought they belonged in the sky, but they belong on Earth. To the cosmos, they are more like obscurants. They confuse our understanding of the sky.

Here we have to make a distinction:

They don't belong in the sky, they belong to us.

We revolve around the Sun, and the Moon revolves around us.
The sun and the moon, as the two with the highest apparent magnitude, must also have been the first celestial bodies to be noticed by us. Humans once worshipped them as gods, and created calendars according to their orbits. And so, we have the past and the future.