When God made the earth he didn't make Sunday through Saturday. We did that. Man named the days. And what about Leap year? "Why are there seven days a week, twenty-four hours a day, sixty minutes in an hour and sixty seconds in a minute? There is no mathematical or astronomical reason for the number of days in a week as there is for the number of days or months in a year, which are determined by the movements of the sun and moon, respectively. The Babylonians were the first civilization to have a sevenday week. They created a seven day week so they could devote one day a week to worship the seven heavenly bodies that they knew--Mercury,Venus,Mars,Jupiter,Saturn,the moon and the sun. Later in history, other cultures had weeks varying in length from four to ten days, depending on the frequency of their markets. Roman farmers worked the fields for seven days and went to market on the eighth. Therfore, the Romans had an eight-day week. Our modern seven day week resulted from the spread of Christianity. In the Book of Genisis, God created the world in six days;on the seventh day (the Sabbath) He rested. The word "Sabbath" is from the Babylonian "Sabattu," a word that came into use during Jewish captivity under the Babylonians. The Jewish Sabbath is on Saturday, as was the Romans'. The Romans considered Saturday, ruled by Saturn, to be an unlucky day and thus chose it to be a day of rest. During the French Revolution in 1792, France established a ten-day week with three-week months. Each day had ten hours consisting of one hundred minutes and each minute was comprised of one hundred seconds. This system was extremely logical (as was the metric system, also established during the French Revolution). Alas, the system was used only thirteen years, until Napoleon took power and returned France to the old Gregorian system, in order to please the Pope. Regardless of the source today we all use the seven-day week. We can thank the Babylonians for the purely artificial divisions of seconds, minutes, and hours. Again, any number could have been chosen, but the Babylonians considered sixty a mystical number because no lower number could be divided by more numbers. Had the system of divisions been created recently, it would doubtless be based on a system of tens, as is the modern metric system. We have the Egyptians to thank for the crazy number of hours in a day. They divided the night up into twelve segments, corresponding with the rising of twelve different stars or constellations over the eastern horizon. They had ten divisions for daytime, representing the ten different positions of the sun, and two more divisions for dawn and dusk. This eventually became the twenty-four hour day that we are still using." This quote was taken from Don Voorhees book. The Book of Totally Useless Information. If our days and our hours are so changed how can we be sure of the day that is our Saturday is actually the Sabbath day meant to be observed? Just food for thought