so they could keep track of the days and special event and holidays they had
The first lunar calendar was developed by ancient civilizations such as the Sumerians, Babylonians, and Egyptians. The Babylonians are credited with creating one of the earliest known lunar calendars, based on the cycles of the Moon's phases.
The first 365-day calendar, known as the solar calendar, is believed to have been developed by the ancient Egyptians around 2700 BC. This calendar was based on the annual cycle of the sun and consisted of 12 months of 30 days each, with an additional 5 or 6 days added at the end of the year to align with the solar cycle.
The Chinese calendar was developed by Emperor Huang Di in the 27th century BC during the Xia Dynasty. It is a lunisolar calendar based on the movements of the moon and the sun.
The Sumerians invented it and it had been changed over time.
Though no one knows for certain who actually invented the zodiac calendar, historians and astronomers feel it was first in ancient Babylon. It was most likely around eighteen hundred years before Christ. It was based around the planets and stars.
George Washington invented the lunar calendar
The name of the person that invented the first calendar is not known. The first calendar was invented in Scotland.
China
The Egyptian
Rome
The calendar was technically first invented by the Ancient Egyptians.
1yr=365day 2yr=730day
I t was invented around 4231 B.C.
The Romans invented it in 46 ad.
Egypt
Around 500BC
173 a.c.