Definition: "Day Calendar," a term in the Old Testament, signifies a fixed time for each day of the week. It's used to mark important events or days in religious observances like Sabbath, Passover, or even daily prayers. This concept was integral to the Jewish calendar system and is reflected in the Hebrew word "day," which has multiple meanings depending on its context: Day refers to a specific season (as in "days of preparation for harvest") while day represents one day of life (as in "day after death").