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Iranian calendars
:''For the official calendar in Iran and Afghanistan, see Solar Hijri calendar''
The Iranian calendars ((ペルシア語:گاهشماری ایرانی) ''Gâhshomâriye Irâni'') are a succession of calendars invented or used for over two millennia in Iran (Persia). 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 is now the official calendar in Iran and Afghanistan. It begins at the midnight nearest to the instant of the vernal equinox as determined by astronomical calculations for the Iran Standard Time meridian (52.5°E or GMT+3.5h). It is, therefore, an observation-based calendar, unlike the Gregorian, which is rule-based.〔M. Heydari-Malayeri, (A concise review of the Iranian calendar ), Paris Observatory.〕
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 hijri year. A short table of year correspondences between the Persian and Gregorian calendars is provided below.
== History ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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