[cdot2]

I don't think people have put enough stock in the possibility that the Antikythera device was primarily used for astrology. This would likely have been the primary reason an ancient person would want to know the positions of the stars and planets on a specific date and time.

[kromem]

At the time the two fields weren't seen as separate things as they are now.

Astrology and astronomy were pursued by the same figures, much as Newton pursued alchemy as well as physics.