It is important to recognize how a day is measured in the Bible in order to know how and when to celebrate the Sabbath. In those days, they did not have clocks to measure time, so they had to follow nature. A day was measured starting at sunset and ending at sunset the following evening. Very different than how we measure it today (midnight to midnight). See also the Creation story, Genesis 1:5. Please look below the graphic for references to scriptures. Leviticus 23:32 32 It