Not in the beginning, but early in the history of the world, many mortals suspected that the ones who called themselves gods were shirking their duty of properly governing the world. Some responded by entreating the gods. Others by railing against them.
But a few decided to try answering the question of what it was that the gods spent their time doing if they were not doing what was expected.
It was known that the gods lived far above the earth and somewhere below the stars. Their abode was not visible to mortal eyes, but if human sight could be extended, perhaps human eyes could see the comings and goings of the gods, and follow their course to where they landed in the mortal earthly realm.