THE GREAT MUSLIM SCIENTISTS

MUHAMMAD IBN KATHIR AL-FARGHANI
He was involved in the calculation of the diameter of the Earth by the measurement of the meridian arc length together with a team of scientists

His textbook Kitab fi Jawami “Ilm al-Nujum (A Compendium of the Science of the Stars) or Elements of astronomy on the celestial motions, written about 833, was a competent descriptive summary of Ptolemy's Almagest, while using the findings and revised values of earlier Islamic astronomer

— Ref.: http://en.wikipedia.org/wiki/Al-Farghani