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The seven-day week dates back to the time of Moses and the origin of the Torah, including the "Ten Commandments". One of the Ten Commandments is to remember that every seventh day, the Sabbath, is a holy day on which no work may be done.

Despite the sacrilege of Emperor Constantine of Rome, proclaiming the first day of the week, the day of the sun god, to be the day of rest instead of the seventh day, thanks to calendars the cycles of seven days have endured in many places like an unbroken chain through time for over five millennia.

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Q: Who invented the first seven-day calendar?
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Continue Learning about History of Western Civilization

Who developed the modern calendar?

The calendar was technically first invented by the Ancient Egyptians.


Who invent the calendar?

Historians do not know who or when mankind invented the first calendar, probably early man when he first carved a notch into a stick or a bone which marked the passing of each full moon. Notched bones used to record moon phases have been found in Africa and Europe dating back to about 20,500 BC. There are many different calendars invented by different cultures to suit their needs. The mayans created a calender, but I believe the calendar we use is based off of the Romans. Some also believe that the Sumerians invented the 12-month calendar.


Who invented the gregorian calendar?

The Gregorian calendar was an adaptation of a calendar proposed by Aloysius Lilius in 1582. However, the calendar is named after Pope Gregory XIII who introduced this calendar by a papal bull. It was a reform to the Julian calendar.


Who invented the english calendar?

Properly speaking, there is no "English" calendar system. You probably mean the predominant Western Calendar (also called the Christian Calendar). This calendar system is best called the "Gregorian Calendar", after Pope Gregory XIII who introduced the calendar system in 1582.


Why was the calendar invented?

I think the main reason was to know when the times for planting and harvesting were approaching. Another big reason was knowing when to celebrate religious festivals.Calenders were invented to keep track of when it would get cold and when it was a good time to plant crops at first