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  2. Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Islamic_calendar

    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.

  3. Solar Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_Hijri_calendar

    The first day of the Solar Hijri calendar was the day of the spring equinox, March 18, 622 CE. The calendar is named the "Hijri calendar" because that was the year that Mohammed is believed to have left from Mecca to Medina, which event is referred to as the Hijrah. This year is generally considered by Muslims as the first year of Islam.

  4. Tabular Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Tabular_Islamic_calendar

    Tabular Islamic calendars based on an 8-year cycle (with 2, 5 and 8 as leap years) were also used in the Ottoman Empire and in South-East Asia. [4] The cycle contains 96 months in 2835 days, giving a mean month length of 29.53125 days, or 29d 12h 45m. Though less accurate than the tabular calendars based on a 30-year cycle, it was popular due ...

  5. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    Since each lunation is approximately 29 + 1 ⁄ 2 days, [1] it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of 12 such lunations, a lunar year, is 354 days, 8 hours, 48 minutes, 34 seconds (354.36707 days), [1] purely lunar calendars are 11 to 12 days shorter than the solar year.

  6. Jalali calendar - Wikipedia

    en.wikipedia.org/wiki/Jalali_calendar

    Jalali calendar. The Jalali calendar, also referred to as Malikshahi and Maliki, [1] is a solar calendar compiled during the reign of Jalaluddin Malik-Shah I, the Sultan of the Seljuk Empire (1072–1092 CE), by the order of Grand Vizier Nizam al-Mulk, using observations made in the cities of Isfahan (the capital of the Seljuks), Rey, and Nishapur.

  7. Islamic holidays - Wikipedia

    en.wikipedia.org/wiki/Islamic_holidays

    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.

  8. Ramadan (month) - Wikipedia

    en.wikipedia.org/wiki/Ramadan_(month)

    The Islamic calendar is a lunar one, where each month begins when the first crescent of a new moon is sighted. The Islamic year consists of 12 lunar cycles, and consequently it is 10 to 11 days shorter than the solar year, and as it contains no intercalation, [a] Ramadan migrates throughout the seasons. The Islamic day starts after sunset.

  9. Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Hijri_calendar

    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.