Piece of the Antikythera Mechanism

Origin
The Antikythera mechanism is an ancient analog computer designed to predict astronomical positions and eclipses for calendrical and astrological purposes, as well as the cycles of Olympic Games. The pieces of the mechanism were discovered in a shipwreck in 1900.

Effect
This is the central gear of the Antikythera Mechanism. When held, the user can perfectly predict any celestial event. Eclipses, meteor showers, etc. It has been observed that some users's lung fill with sea water, although the reason is unknown.