The Babylonians developed a calendar based on the moon and sun cycles. The Lunar calendar was designed to work in conjunction with the solar cycle by adding leap months known an "intercalary" months.
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APA Style
DrDavidNeiman. (2017, March 25). Cradles of Civilization - The Lunar/Solar Calendar. World History Encyclopedia. https://www.worldhistory.org/video/1125/cradles-of-civilization---the-lunarsolar-calendar/
Chicago Style
DrDavidNeiman. "Cradles of Civilization - The Lunar/Solar Calendar." World History Encyclopedia, March 25, 2017. https://www.worldhistory.org/video/1125/cradles-of-civilization---the-lunarsolar-calendar/.
MLA Style
DrDavidNeiman. "Cradles of Civilization - The Lunar/Solar Calendar." World History Encyclopedia, 25 Mar 2017, https://www.worldhistory.org/video/1125/cradles-of-civilization---the-lunarsolar-calendar/.