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Noting that the average year has 354 + 11 ⁄ 30 days and a common year has 354 days, at the end of the first year of the 30-year cycle the remainder is 11 ⁄ 30 day. Whenever the remainder exceeds a half day ( 15 ⁄ 30 day), then a leap day is added to that year, reducing the remainder by one day.
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 ...
Islamic calendar stamp issued at King Khalid International Airport on 10 Rajab 1428 AH (24 July 2007 CE). The Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), or Arabic calendar, also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.
The Hijri era is calculated according to the Islamic lunar calendar, whose epoch (first year) is the year of Muhammad's Hijrah, and begins on the first day of the month of Muharram (equivalent to the Julian calendar date of July 16, 622 CE). [2] [b] The date of the Hijrah itself did not form the Islamic New Year.
The Islamic New Year (Arabic: رأس السنة الهجرية, Raʿs as-Sanah al-Hijrīyah), also called the Hijri New Year, is the day that marks the beginning of a new lunar Hijri year, and is the day on which the year count is incremented. The first day of the Islamic year is observed by most Muslims on the first day of the month of Muharram.
The Tabular Islamic calendar, a rule-based variation of the Islamic calendar. It has the same numbering of years and months, but the months are determined by arithmetical rules rather than by observation or astronomical calculations. In Iran The Solar Hijri calendar, whose year begins at the moment of the Spring equinox in the northern hemisphere.
The calendar's epoch (first year) corresponds to the Hijrah in 622 CE, which is the same as the epoch of the Lunar Hijri calendar but as it is a solar calendar, the two calendars' year numbers do not coincide with each other and are slowly drifting apart, being about 43 years apart as of 2023.
The Islamic calendar is a lunar calendar, and months begin when new moon is sighted. Since the Islamic lunar calendar year is 11 to 12 days shorter than the solar year, Dhu al-Hijjah migrates throughout the seasons. The estimated start and end dates for Dhu al-Hijja, based on the Umm al-Qura calendar of Saudi Arabia, are: [2]