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It is a solar calendar and is the one Iranian calendar that is the most similar to the Gregorian calendar, being based on the Earth's orbit around the Sun. It begins on the March equinox as determined by the astronomical calculation for the Iran Standard Time meridian (52.5°E, UTC+03:30 ) and has years of 365 or 366 days.
This change was reversed slightly more than two years later, on September 2, 1978 (11 Shahrivar 2537, which became 11 Shahrivar 1357), in the wake of civil unrest preceding the Iranian revolution, and the calendar reverted to Solar Hijri. [8] [9] Correspondence of Solar Hijri and Gregorian calendars (Solar Hijri leap years are marked *): [10]
For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given. The first Hijri year (AH 1) was retrospectively considered to have begun on the Julian calendar date 15 July 622 (known as the 'astronomical' or 'Thursday' epoch, Julian day 1,948,439) or 16 July 622 (the ...
There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) [1] and Afghanistan (Lunar Hijri Calendar). [2] Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the ...
Mehr (Persian: مهر, Persian pronunciation: [1]) is the seventh month of the Solar Hijri calendar, the official calendar of Iran and Afghanistan. [1] Mehr has thirty days. [1] It begins in September and ends in October by the Gregorian calendar. [citation needed] Mehr is the first month of autumn, and is followed by Aban. [1]
Farvardin (Persian: فروردین, Persian pronunciation: [fæɾvæɾˈdiːn] [1]) is the Iranian Persian name for the first month of the Solar Hijri calendar, [1] the official calendar of Iran, and corresponds with Aries on the Zodiac. Farvardin has thirty-one days. [1] It is the first month of the spring season (Bahar), and is followed by ...
Dey (Persian: دی, Persian pronunciation: [1]) is the tenth month of the Solar Hijri calendar, the official calendar of Iran and Afghanistan. It marks the start of winter. [1] It has thirty days, [1] beginning in December and ending in January of the Gregorian Calendar. The associated astrological sign in the tropical zodiac is Capricorn. [1]
Iran uses three official calendar systems, including the Solar Hijri calendar as the main and national calendar, the Gregorian calendar for international events and Christian holidays, and the Lunar Hijri calendar for Islamic holidays.