The professional muezzin is chosen for his good character, voice and skills to serve at the mosque. Muezzins are typically men. The muezzin is not considered a
cleric, as he cleans the toilets and the place where people wash their hands, face and feet when they perform the
Wuḍu' (
Arabic:
wuḍū’ وُضُوء, the "purification" of ablution) before offering the prayer. When calling to prayer, the muezzin faces the
qiblah, the direction of the
Ka'bah in
Makkah, while reciting the
adhan. From the fourteenth century, initially in
Mamluk Egypt but then spread into other parts of the Islamic world, major mosques might employ a related officer, the
muwaqqit, who determined the prayer times using mathematical astronomy. Unlike the muezzin, who were typically chosen for their piety and beautiful voice, the qualification of the muwaqqit required special knowledge in astronomy. Historian Sonja Brentjes speculates that the muwaqqit might have evolved from a specialised muezzin, and that there might not have been a clear delineation between the two offices. Some celebrated muwaqqits, including
Shams al-Din al-Khalili and
ibn al-Shatir, were known to have once been muezzins, and many individuals held both offices simultaneously. Today, with the production of electronic devices and authoritative timetables, a muezzin in a mosque can broadcast the call to prayer by consulting a table or a clock without requiring the specialised skill of a
muwaqqit. ==Call of the muezzin==