Hijri & Gregorian Calendar

The Hijri year consists of 12 months, and each month consists of approximately 29 or 30 days
The Hijri calendar is based on a lunar calendar, where months are determined based on the movement of the moon around the Earth. The Hijri year begins with the migration of the Prophet Muhammad (PBUH) from Mecca to Medina in 622 AD, which is considered the starting point of the Hijri calendar. The Hijri year consists of 12 months, and each month consists of approximately 29 or 30 days. The beginning of each month is determined by the sighting of the new moon. As for the years, they usually consist of 354 or 355 days, so the Hijri year is shorter than the Gregorian year by about 10-12 days. The Hijri calendar is mainly used in the Islamic world to determine important days such as Ramadan, Eid al-Fitr, and Eid al-Adha, in addition to determining the periods of fasting and other acts of worship.
Reason for the name :
The Hijri calendar was named after the migration of the Prophet Muhammad, may God bless him and grant him peace, from Mecca to Medina in 622 AD. This migration is considered a pivotal event in the history of Islam, as it constituted a turning point in the path of the Islamic call and became the beginning of the Islamic calendar.
Components of the Hijri calendar :
The Hijri calendar consists of three main components:
Hijri month: The period of time that begins with the sighting of the crescent and ends with the sighting of the next crescent.
Hijri day: The period of time from midnight to the next midnight.
Hijri year: It consists of 12 Hijri months.
Arrangement of the Hijri months : 
The Hijri calendar consists of 12 Hijri months, which are arranged as follows:

Muharram
Safar
Rabi' al-Awwal
Rabi' al-Akhir
Jumada al-Ula
Jumada al-Akhira
Rajab
Sha'ban
Ramadan
Shawwal
Dhu al-Qi'dah
Dhu al-Hijjah
Number of days in the Hijri year:
The Hijri year consists of 354 or 355 days, and the number of days in the year depends on the lunar cycle. In some years, the number of days in the Hijri month is 29 days, and in other years it is 30 days.
The most important religious occasions in the Hijri calendar 1446 
The Hijri calendar 1446 contains many important religious occasions that Muslims around the world celebrate, the most prominent of which are:

Hijri New Year: It falls on the first of Muharram, which is the beginning of the Hijri year.
Ashura Day: It falls on the tenth of Muharram, which is a day of great religious importance.
Night of Isra and Mi'raj: It falls on the twenty-seventh of Rajab, which is the night on which the Prophet Muhammad was taken from Mecca to AlQuds.
The blessed month of Ramadan: It begins on the first of Ramadan, which is the month of fasting, which is one of the five pillars of Islam.
Eid al-Fitr: It falls on the first of Shawwal, and Muslims celebrate it after the end of Ramadan.
Eid al-Adha: It falls on the tenth of Dhul-Hijjah, and is celebrated by Muslims after the Day of Arafat during the Hajj season.
source: https://www.iskannews.com/61277  
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