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Khalid ibn Abd al-Malik al-Marwarrudhi

Astronomer
Khālid ibn ʿAbd al‐Malik al‐Marwarrūdhī was a 9th-century Baghdadi astronomer. In 827, Marwarrūdhī, together with the astronomer ʿAlī ibn ʿĪsā al-Asṭurlābī and a party of surveyors, measured the length of a meridian arc of one degree of latitude. Wikipedia