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Islamic calendar

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The Islamic calendar, also known as the Hijri calendar, is a lunar calendar system. It consists of 12 lunar months. A single year usually lasts 354 or 355 days.

Inscription of years by A.H.&A.D. eras
Inscription of years by A.H.&A.D. eras

This calendar is essential for determining the dates of Islamic holidays and religious rituals. These include the annual season for the great pilgrimage and the month of fasting. While most countries where Islam is the predominant religion use the Gregorian calendar for civil matters, they use the Hijri calendar for religious purposes. In the Levant and Mesopotamia, people may use Syriac month-names for their civil calendars.

The Hijri era begins with a specific historical event called the Hijrah. In the year 622 CE, Muhammad and his followers migrated from Mecca to Medina. This move helped establish the first Muslim community, known as the ummah.

Inscription of years by A.H.&A.D. eras
Inscription of years by A.H.&A.D. eras

In Western writing, years in this era are often denoted as AH. In many Muslim countries, it is abbreviated as H. Years occurring before the Hijra are labeled as BH, which stands for "Before the Hijra." For example, the year 1447 AH begins on 26 June 2025 and ends around 15 June 2026.

The mechanism of the calendar relies on the observation of the moon. Each month begins with the birth of a new lunar cycle. Traditionally, this is marked by the actual observation of the new crescent moon. Because of the Earth's position, the weather, or the moon's astronomical positioning, a month may have 29 or 30 days.

استهلال ماه رمضان در شهر قم، عکاس مصطفی معراجی، بلندی های بوستان علوی قم 12
استهلال ماه رمضان در شهر قم، عکاس مصطفی معراجی، بلندی های بوستان علوی قم 12

The Islamic day follows a different cycle than the solar day. An Islamic day begins at sunset and ends at the following sunset. This means the day starts at nightfall.

The seven-day week follows a specific naming pattern. Most days are named based on their ordinal place in the week. For instance, the second day is al-Ithnayn, and the fifth is al-Khamis. The sixth day is al-Jum'ah, which means the "gathering day."

King Khaled airport exit stamp
King Khaled airport exit stamp

On this day, Muslims assemble for Friday prayers at a mosque at noon. This day is often treated as a weekly day of rest. Different countries handle the weekend differently; some use Friday and Saturday, while others use Saturday and Sunday.

History shows that pre-Islamic Arabia used various time-tracking methods. Some South Arabian calendars used a lunisolar system, which combines the moon and the sun. Muslim authors from the Abbasid era suggest that ancient Arabs used names similar to the current Islamic months. There is a concept in Islamic tradition regarding "forbidden" months, or ḥarām months. These were four months when fighting was prohibited: Rajab and the three-month period containing the pilgrimage season. These months were Dhu al-Qa‘dah, Dhu al-Hijjah, and Muharram.

Scholars have debated the nature of a practice called Nasī. Nasī literally means "postponement." Some researchers believe the pre-Islamic calendar was purely lunar. They suggest Nasī involved moving religious events within the calendar rather than changing the calendar itself. Other scholars, such as the astronomer Abu Ma'shar al-Balkhi, proposed that the calendar was once lunisolar. They suggest Arabs used intercalation, or adding an extra month, to keep the pilgrimage in a specific season.

This practice was eventually prohibited. Muhammad addressed this during his farewell sermon on 9 Dhu al-Hijjah AH 10.

The months of the Hijri calendar carry deep significance. Four months are considered sacred: Rajab, Dhu al-Qa‘dah, Dhu al-Hijjah, and Muharram. During these times, battles are forbidden. Ramadan is perhaps the most venerated month. It is associated with "burning heat" and the practice of fasting. During Ramadan, Muslims refrain from sinful acts and do not eat from pre-dawn until sunset.

استهلال ماه رمضان در شهر قم، عکاس مصطفی معراجی، بلندی های بوستان علوی قم 12
استهلال ماه رمضان در شهر قم، عکاس مصطفی معراجی، بلندی های بوستان علوی قم 12

The end of this month is marked by the festival of Eid al-Fitr, the "Festival of Breaking the Fast."

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File:Muhammad forbids the intercalation of an additional month in the lunar year.png
Muhammad forbids the intercalation of an...
File:استهلال ماه رمضان در شهر قم، عکاس مصطفی معراجی، بلندی های بوستان علوی قم 12.jpg
استهلال ماه رمضان در شهر قم، عکاس مصطفی...
File:Inscription of years by A.H.&A.D. eras.jpg
Inscription of years by A.H.&A.D. eras.jpg
File:King Khaled airport exit stamp.jpg
King Khaled airport exit stamp.jpg
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