In old times, the hour was detected by the position of the sun in the sky, and which hour may slightly differ in minutes from place to place, depending on the elevation and the terrain.
In old times, the hour was detected by the position of the sun in the sky, or when the first three stars appeared in the night sky. The conclusion of a day at the end of twilight may slightly vary in minutes from place to place, depending on the elevation and the terrain.