Note Note 6 — CHAPTER 21.
Reading edition
6. Watches of the Night.—During the greater part of Old Testament time, the people of Israel divided the night into three watches, each of four hours, such a period being that of individual sentinel duty. Before the beginning of the Christian era, however, the Jews had adopted the Roman order of four night-watches, each lasting three hours. These were designated numerically, e.g. the fourth watch mentioned in the text (see Matt. 14:25), or as even, midnight, cock-crowing, and morning (see Mark 13:35). The fourth watch was the last of the three-hour periods between sunset and sunrise, or between 6 p.m. and 6 a.m. and therefore extended from 3 to 6 o'clock in the morning.