The three largest fragments of the Antikythera Mechanism as they have been recovered from the sea by sponge divers in the early 20th century.
The largest fragment is the fragment A. 27 gears were detected inside that fragment.
Dr. Marianna Efstathiou, member of the academic team of the Aristotle University of Thessaloniki, which investigates the Antikythera Mechanism, describes the modus operandi of the Mechanism.
The text describes how the Antikythera Mechanism simulates the movements of the system Moon-Earth-Sun (i.e. the elliptical orbit of the Moon around the Earth)