As Iranians celebrate the Persian New Year, explore the fascinating calendars still used around the world—shaped by sun, moon ...
For example, the Julian date for December 11 ... Contrast with "Gregorian date," which is the common calendar notation of month, day and year. THIS DEFINITION IS FOR PERSONAL USE ONLY.
We once used to embrace a 13-month calendar, and some cultures still follow this format. So why are they 12 months instead of 13?