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Abū l-Ḥusayn ʿAbd al-Raḥmān b. ʿUmar al-Ṣūfī (291–376/902–86), a famed astronomer known in Europe as Azophi, is renowned for his expertise on the fixed stars and the constellations. Born in Rayy, he appears to have spent his life in Iran, where he had a close relationship with t…
Azimuth is a modern astronomical term marking, in the horizon coordinate system, the angle along the horizon in a clockwise direction from the south or north point to the point where a vertical arc through the zenith (samt al-raʾs or al-ruʾūs) and a celestial body, such as the s…