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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 Islamic calendar is based on the synodic period of the Moon's revolution around the Earth, approximately 29 1 ⁄ 2 days. The Islamic calendar alternates months of 29 and 30 days (which begin with the new moon). Twelve of these months make up an Islamic year, which is 11 days shorter than the Gregorian year.
A year in the Islamic lunar calendar consists of twelve lunar months and has only 354 or 355 days in its year. Consequently, its New Year's Day occurs ten days earlier each year relative to the Gregorian calendar. The year 2024 CE corresponds to the Islamic years AH 1445 – 1446; AH 1446 corresponds to 2024 – 2025 in the Common Era. [a]
The Islamic Republic government changed the original date to coincide with the assassination of Morteza Motahhari on 1 May 1979. May 1: May 2: May 3 14 Khordad: Anniversary of the Death of Khomeini: Public holiday in Iran: June 3: June 4: June 5 15 Khordad: Anniversary Revolt of Khordad 15: Public holiday in Iran: June 4: June 5: June 6 13 Tir ...
All religious duties, such as prayer, fasting in the month of Ramadan, and pilgrimage, and the dates of significant events, such as celebration of holy nights and festivals, are calculated according to the Islamic calendar. While some Islamic organizations prefer determining the new month (and hence the new year) by local sightings of the moon ...
The Islamic calendar is a purely lunar calendar, and months begin when the first crescent of a new moon is sighted. Since the Islamic lunar year is 11 to 12 days shorter than the solar year, Jumada al-Thani migrates throughout the seasons.
The Islamic calendar is a purely lunar calendar, and months begin when the first crescent of a new moon is sighted. Since the lunar year is 11 to 12 days shorter than the solar year, Rajab migrates throughout the seasons. The estimated start and end dates for Rajab, based on the Umm al-Qura of Saudi Arabia, are: [2]
In principle, each Islamic month begins with sighting of the new crescent moon (after a New Moon) at sunset. Because of this, the calendar is dependent on observational conditions and cannot be predicted or reconstructed with certainty, but tabular calendars are in use which determine the dates algorithmically. Because of this, dates may vary ...