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When did people invent the calendar?

The earliest known calendar was found in modern day Scotland.  This calendar consisted of twelve pits dug into the ground based on the various moon phases.  This calendar system is about 10,000 years old.  The calendar was created by hunter-gatherers in prehistoric Scotland.


The Sumerian people created a calendar which was also based on the phases of the moon.  This calendar had twelve months, which were labeled by numbers.  The new moon signified the beginning of each month.  This calendar was used from around 2000 BC until about 500 BC.


The early Egyptian calendar was both a lunar and solar one.  It was primarily based on the moon phases.  The Egyptians also identified three seasons.  Their calendar had 365 days and twelve months.  This calendar was created around 3000 BC.


Julius Caesar created the Julian calendar, which was based on the Roman calendar.  This calendar had 365 days within twelve months.  Our modern calendar has many similarities to the Julian calendar.  The Julian calendar was created around 50 BC.

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