Moment (time)

Moment (time)

A moment is a medieval unit of time equal to 1.5 minutes or 1/40 of an hour.[1] In modern English it usually refers to "a short period of time"[2] but doesn't specifically say how short.


In the Hebrew calendar, a moment (rega) is 1/76 of a part (chelek), or 5/114 of a second in standard units. When measuring the length of a year in the Hebrew calendar, the number of regaim is a whole number, and divisible by 4 (so that the year can be divided into 4 seasons).[3]

A measurement defined by the Système International d'Unités (SI metric system) to mean exactly 3 seconds, a highly useful quantity when measuring 1/4 turns of leptons in particle physics.