When we speak about the first calendar in the history, the early schedules were cultures that lived in the valley of the Tigris and Euphrates rivers in Mesopotamia. Apparently these calendars were possibly created by observing the moon.
So the Babylonians cures have created the calendar based on cycles of 29.5 days between each moon. And the period of the moon, to which the year is divided into twelve moons or months, and was a total of three hundred and fifty-four days.
But what happened is that these amazing calendars had a problem: not coincided with the interval between waning crescent moon and old, giving a total of 29 days, and this toward the solar year is much left the lunar cycle.
To remedy this difference between the seasons, the priests incorporated the days that corrected cycle´s difference. Then they created the system to incorporate 7 months, divided into a period of 19 years to get in line.
The Babylonian system was useful as a model for Jews and Muslims, but they also made its changes.
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