Hastings' Dictionary of the Bible (1898)
E'VENING, Ps 55:17, E'VENTIDE. Gen 24:63. The Hebrews reckoned two evenings, one commencing at sunset and embracing the period of twilight, and the other commencing at dark. Some suppose that the first evening commenced as early as 3 o'clock in the afternoon, and the second at sunset. It was in the interval between the two evenings, at whichever of these periods it occurred, that the passover was to be killed and the daily sacrifice offered. See marginal reading of Ex 12:6; Num 9:3; 1 Sam 28:4.