Solar Hejri Calendar
The Iranian calendar is an observational calendar that starts on the spring equinox and adds a single intercalated day to the last month (Esfand) once every four or five years; the first leap year occurs as the fifth year of the typical 33 year cycle and the remaining leap years occur every four years through the remainder of the 33 year cycle. The system used is more accurate and more complicated, and is based on the time of the March equinox as observed from Tehran. The 33 year period is not completely regular; every so often the 33-year cycle will be broken by a cycle of 29 or 37 years.
Read more about this topic: Leap Year
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