Qibla
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The qibla is the direction towards the Kaaba in the Sacred Mosque in Mecca, which is used by Muslims in various religious contexts, particularly the direction of prayer for the salah. In Islam, the Kaaba is believed to be a sacred site built by prophets Ibrahim and Ismail, and that its use as the qibla was ordained by Allah in several verses of the Quran revealed to Muhammad in the second Hijri year. Prior to this revelation, Muhammad and his followers in Medina faced Jerusalem for prayers. Most mosques contain a mihrab that indicates the direction of the qibla.
The Mihrab in one of the walls of a mosque indicates the qibla direction to be used for prayers. Picture from the Shah-i-Zinda, Samarkand, Uzbekistan.
A portion of the qibla table compiled by astronomer and muwaqqit Shams al-Din al-Khalili of Damascus in the 14th century. The qibla directions are listed in the Arabic sexagesimal notation.
The Islamic Center of Washington (founded 1953), one of the early mosques in the United States. Its qibla faces the northeast in line with astronomical calculations.
Mihrab
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Mihrab is a niche in the wall of a mosque that indicates the qibla, the direction of the Kaaba in Mecca towards which Muslims should face when praying. The wall in which a mihrab appears is thus the "qibla wall".
8th-century marble mihrab found in the al-Khassaki Mosque in Baghdad, now housed at the Iraq Museum
Pair of candlesticks from an Ottoman Turkish mosque, late 16th century
Mihrab in the Great Mosque of Damascus