Sacred time is a "time out of time," when the community's sense of the sacred interrupts ordinary experiences of time. Like its sister religions, Judaism and Christianity, Islam marks the moments of sacred time in an annual calendar. The calendar is divided into twelve months, each with 29-30 days. The months are further divided into weeks of seven days each. As in Judaism, the days last from sunset to sunset. The calendar marks annual times that are particularly sacred to Muslims, such as the Night of Power. Celebrated on the 27th of Ramadan, this was the night when Muhammad received the first revelation of the Quran. The entire month of Ramadan is also sacred and is a time in which the powers of evil are diminished by the sacred event of the original revelation. Daily life is also punctuated by moments of holiness, signaled by the call of the muezzin to prayer.
In 622, the Muslim community emigrated from Mecca, where they were persecuted, to Medina, where they were welcomed. This event, called the Hijrah or emigration, marks the beginning of the time of Islam. It marks a break from the former time, or the time before Islam, called al-Jahiliyya. This significance is reflected in the Islamic calendar, called the Hijrah calendar, in which 622 is year one, or 1 A.H. (after Hijrah).
The Hijrah calendar is a lunar calendar. It has twelve months of 29 or 30 days each, for a total of 354 days. Muslims use the solar calendar for non-religious purposes, and the lunar Hijrah calendar does not adjust to keep pace with the solar one. In any given 33-year cycle, annual observances like the Ramadan fast and the hajj will occur in each of all four seasons. The week has seven days, and the days begin and end at sunset. Fridays are set aside for communal prayers in the mosque, often accompanied by a sermon. Many businesses will close to allow people to attend the midday Friday prayers.
The Hijrah calendar includes many sacred days. There are days that commemorate important historical events, such as the Miraj, which celebrates Muhammad's miraculous journey from Mecca to Jerusalem. Other days remember anniversaries of Muhammad's birth and death, and those of his daughter Fatima. There are also days and months set aside for participation in religious observances and festivals, such as the month-long Ramadan fast and the season of the hajj. The main festivals and holy days are as follows.
Millions of Muslims make their hajj, or pilgrimage, during the twelfth month, called Dhu al-Hijjah. The Feast of Sacrifice, or Eid al-Adha, is celebrated on the tenth day of Dhu al-Hijjah. All Muslims celebrate Eid al-Adha, whether they are on pilgrimage or not. It is Islam's most important annual festival, commemorating Abraham's willingness to sacrifice his own son. In the Islamic tradition, the son Abraham nearly sacrificed was Ishmael. God substituted a ram for Abraham to sacrifice, and to honor the event, the male head of each household who can afford to do so is expected to sacrifice a sheep, cow, goat, or camel. The sacrifice is regulated in Islamic law. The animal must be facing Mecca, and its throat must be cut quickly. The meat is cooked and one-third is shared by the family. The rest is shared with the poor and with other families. This is a social occasion, with families exchanging gifts and sweets and inviting non-Muslims to share in the festivities. Families will also visit the graves of ancestors during this special occasion. A similar feast is Eid al-Fitr, or the Feast of the Breaking of the Fast, which celebrates the conclusion of the fasting month of Ramadan in the ninth lunar month. Both Eids are three-day holidays.
The first month of the Muslim year is called Muharram, when Muslims celebrate the New Year and commemorate the emigration from Mecca. Muhammad's birthday occurs on the twelfth day of the third month, Rabi' al-Awwal, and Muslims celebrate and read religious texts. In some countries Muhammad's birthday is a public holiday, and in some regions the celebration lasts all month. Muslims celebrate the anniversaries of the birth and death of several important historical figures, including Muhammad. The Shi'a also celebrate the birthday of Ali, Muhammad's cousin and son-in-law, and the twelve imams. Sufi communities celebrate the birthdays of their founders, and the birthdays of holy men and women are celebrated locally in the places where they are honored. These celebrations are called mawalid, and include visiting shrines and tombs, touching the tomb to receive a blessing, donating money, or sacrificing an animal.