who invented 365 day calendar. The earliest known calendars date back to prehistoric europe, around 32,000 bc, using lunar cycles. To solve this problem the egyptians invented a schematized civil year of 365 days divided into three seasons, each of which consisted of four months of 30 days each.

who invented 365 day calendar To solve this problem the egyptians invented a schematized civil year of 365 days divided into three seasons, each of which consisted of four months of 30 days each. Based on the julian calendar, there were 365.25 days in a year. Calendar evolution came as a reformed roman calendar, introduced by julius caesar in 46 bc.