Julius Caesar was believed to have messed up the months in a year, but was trying to fix the solar calendar, resulting in one ...

As a result, the calendar fell quickly out of sync with the passage of the Earth around the Sun, and by around 200 BCE, the calendar was so out of whack that a near-total eclipse that took place ...

From 1000 BCE, most of Central America used similar types of calendars based on material objects and celestial constellations. The two most common calendars were the 260-day festival calendar and the ...