the first accurate calebdar was recorded to be made in 450 B.C.E.
450 BCE
The development of the accurate calender was in 450 B.C.
The Egyptians developed the first accurate calendar.
very accurate :P
The calendar helped Ancient China because the calendar was used to know when certain rivers would flood.
Our calendar is incompletely inaccurate.
The Mr gazzi calendar
China
The Mayans
they were just as accurate as the one we use now with 365 days
The Iranian (Persian) Calendar, is the most accurate and one of the oldest (as far back as 2000 BC Zoroastrianism) calendars.
The Aztec calendar recognised 365 days
calendar