Direction of prayer
Prayer in a certain direction is characteristic of many world religions, such as Judaism, Christianity, Islam, and the Bahá'í Faith.
Judaism
Jews traditionally pray in the direction of Jerusalem, where the presence of the transcendent God in the Holy of Holies of the Temple. Within the Holy of Holies lay the Ark of the Covenant that contained the Ten Commandments tablets given to the prophet Moses by God; this is the reason that the Temple of Solomon became the focal point for Jewish prayer. In the Bible, it is written that when the prophet Daniel was in Babylon, he "went to his house where he had windows in his upper chamber open to Jerusalem; and he got down upon his knees three times a day and prayed and gave thanks before his God, as he had done previously". After the destruction of the Temple of Solomon, Jews continue to pray facing Jerusalem in hope for the coming of the Messiah whom they await.The Talmud instructs Jews outside the Land of Israel to face the Holy Land while praying; Jews residing in Israel should turn towards the city of Jerusalem; those living within Jerusalem should orient themselves towards the Temple Mount, and those next to the Temple Mount should turn towards the former site of the Holy of Holies. The Shulchan Aruch thus specifies that in synagogues, the Ark should be placed such that "worshipers may pray in the direction of the Holy Land and the place of the Sanctuary in Jerusalem". When synagogues are erected, they are built to face Jerusalem.
The is a plaque or other decorative wall hanging which is placed on the eastern wall of many homes of Jews in the Diaspora to the west of Israel, in order to mark the direction of Jerusalem towards which prayer is focused. A plaque is often an artistic, ornate piece, being written in calligraphy and featuring a panorama of Jerusalem. wall hangings typically feature the Hebrew word , and may include the verse from the Torah which states, "From the rising of the sun unto its going down, the Lord's name is to be praised".
Christianity
Since the time of the early Church, the eastward direction of Christian prayer has carried a strong significance, attested by the writings of the Church Fathers. In the 2nd century, Syrian Christians hung a Christian cross on the eastern wall of their house, symbolizing "their souls facing God, talking with him, and sharing their spirituality with the Lord." Two centuries later, Saint Basil the Great declared that one of the unwritten commandments of the Church was to pray facing east. Nearly all Christian apologetic tracts published in the 7th century AD in the Syriac and Arabic languages explicated that the reason that Christians prayed facing the east is because "the Garden of Eden was planted in the east and that at the end of time, at the second coming, the Messiah would approach Jerusalem from the east."Throughout Christendom, believers have hung or painted a Christian cross, to which they prostrated in front of, on the eastern wall of their home in order to indicate the eastward direction of prayer, as an "expression of their undying belief in the coming again of Jesus was united to their conviction that the cross, 'the sign of the Son of Man,' would appear in the eastern heavens on his return." Communicants in the Oriental Orthodox Churches today, and those of the Mar Thoma Syrian Church pray the canonical hours contained in the Agpeya and Shehimo breviaries, respectively facing the eastward direction.
Islam
In Islam, the direction of prayer is known as the and this direction is towards the Sacred Mosque of Mecca. Originally the of Muhammad and his followers in Medina was towards Jerusalem, but it was changed to Mecca after the Quranic verses were revealed in the second Hijri year, about 15 or 16 months after Muhammad's migration to Medina.If a person does not know which direction they are facing, that individual should pray in the direction that they feel is towards Mecca. All mosques are supposed to be designed to be oriented towards the. A niche known as the is built into the wall of a mosque that faces Mecca so that Muslims know in which direction to pray.
File:Kaaba 2.jpg|thumb|left|Muslims surrounding and facing the Kaaba for prayer in Mecca, Saudi Arabia; in Islam, the direction of prayer is referred to as qibla.
The determination of the direction of prayer has been an important problem for Muslim communities throughout history. Muslims are required to know the to perform their daily prayers, and it is also needed to determine the orientation of mosques. Originally, various traditional methods were used to determine the, and from the 8th century onwards Muslim astronomers developed methods based on mathematical astronomy, especially computations techniques based on spherical trigonometry using a location's latitudes and longitudes. In the 14th century, the astronomer Shams al-Din al-Khalili compiled a table containing the for all latitudes and longitudes. Scientific instruments, such as the astrolabe, helped Muslims orient themselves for prayer facing the city of Mecca.