"Two critical numbers in the X-rays of the front cover, of 462 years and 442 years, accurately represent cycles of Venus and Saturn respectively. When observed from Earth, the plants’ cycles sometimes reverse their motions against the stars. Experts must track these cycles over long time-periods to predict their positions. "

https://www.theengineer.co.uk/ucl-team-solves-antikythera-mechanism-mystery/