Chalid Ben Abdulmelik was an Arab astronomer of the 9th century.
Together with AliBenIsa in 827, he measured at 35 degrees north geographical latitude, in the valley of the Tigris, the length of a meridian and thus the Earth's circumference, getting a result of 40,248 km (or, according to other sources, 41,436 km).
The two researchers measured in Arabian ell, and determined the geographical latitudes of the end points they used from the star altitudes in a celestial horizontal coordinate system.
Abu Ali was the 1999 valedictorian at the Islamic Saudi Academy (ISA) of Alexandria, Virginia.
ISA is accused of keeping a high ranking Hamas operative and financier on the payroll for 14 years.
Ali Al-Ahmed, who runs the Saudi Institute, has also been an outspoken critic of ISAs curriculum, saying its denigration of Christianity and Judaism as false religions does not square with the teachings of the Koran.
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