What does ANNUS EST MORA MOTUS QUO SUUM PLAN- ETA PERVOLVAT CIRCULUM mean?

ANNUS EST MORA MOTUS QUO SUUM PLAN- ETA PERVOLVAT CIRCULUM meaning in Law Dictionary

12 months may be the timeframe associated with motion where a planet revolves through its orbit. Dig. 40, 7, 4, 5; Calvin.; Bract. 3596.