Are you one of those people who has only heard about the Antikythera mechanism recently? You are not alone. There are a lot of people who are surprised that this exists even though this has been around since the time of the ancient Greeks. This was used before in order to check eclipses.
The mechanism can provide not only astrological details, it can provide astronomical details as well. This was able to detect the positions and the movements of the planets, the sun, and even the moon. This 2000-year old computer is still being decoded by experts so that they can further understand the details they can gather from it.