This is an official definition authorised by the Astronist Institution.

Great Year

ɡreɪt jɪə

noun | Archaeoastronology

(the Great Year) the belief, propagated by Plato, that the planets are to return to their starting places every 36,000 years; challenged by Augustine; inspiration for the concept of eternal return.

Origin and etymology

  • The word Great Year possess pre-Cometanic origins but, due to its astronomical theme, was classified as part of the philosophical collection and mythology of the Astronic tradition.