the mayans created the first calendar
The Egyptians developed the first accurate calendar.
the mayans made the first calenders until we got more advanced
It was Julius Caesar who changed the calendar from 10 months to 12 months
Egyptians
The Jewish calendar came first. It was created in 3760 B.C. while the Mayan calendar was created in 3372 B.C.
the first accurate calebdar was recorded to be made in 450 B.C.E.
napolean
No, the Mayan calendar is not off by 150 years. There was confusion about the end date of the Mayan Long Count calendar in 2012, but it was a misinterpretation, and the calendar is considered accurate for the time period it was created for.
daniel gabriel fahrenheit is the one who created the first accurate thermometer
shang
very accurate :P