ChristianAnswers.Net WebBible Encyclopedia
The Jews, during the Captivity, learned also from the Babylonians this method of dividing time. When Judea became subject to the Romans, the Jews adopted the Roman mode of reckoning time. The night was divided into four watches (Luke 12:38; Matthew 14:25; 13:25).
An hour was the twelfth part of the day, reckoning from sunrise to sunset, and consequently it perpetually varied in length.