The precession of the equinoxes was discovered, or at least publicized, by the Greek astronomer Hipparchus in the 2nd century BC.Whether the phenomenon was known by Mithraists previously is unknown.

• 岁差运动被发现，至少是公元前二世纪被希腊天文学家希帕克斯宣扬过，密特拉教是否明白这种现象就不得而知。