Iranian calendar

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The Iranian calendars or Persian calendars (Persian: گاهشماری ایرانی‌ Gâhšomâri-ye Irâni) are a succession of calendars invented or used for over two millennia in Greater Iran. One of the longest chronological records in human history, the Iranian calendar has been modified time and again during its history to suit administrative, climatic, and religious purposes.

The modern Iranian calendar (Solar Hejri) is now the official calendar in Iran and Afghanistan. It begins on the vernal equinox as determined by astronomical calculations for the Iran Standard Time meridian (52.5°E or GMT+3.5h). This determination of starting moment is more accurate than the Gregorian calendar because it is synchronized with the vernal equinox year,[1] but requires consulting an astronomical almanac. Its years are designated AP, short for Anno Persico. The Iranian year usually begins within a day of 21 March of the Gregorian calendar. To find the corresponding year of the Gregorian calendar, add 621 or 622 (depending on the time of the year) to a Solar Hejri year. A short table of year correspondences between the Persian and Gregorian calendars is provided below.


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