Al-Sijzi
Abu Sa'id al-Sijzi | |
|---|---|
A page from Al Sijzi's geometrical treatise | |
| Born | 945 CE |
| Died | 1020 CE |
| Philosophical work | |
| Main interests | Mathematics, Astronomy, Astrology |
Abu Sa'id Ahmed ibn Mohammed ibn Abd al-Jalil al-Sijzi (c. 945 - c. 1020, also known as al-Sinjari and al-Sijazi; Persian: ابوسعید سجزی; Al-Sijzi is short for "Al-Sijistani") was an Iranian Muslim astronomer, mathematician, and astrologer. He is notable for his correspondence with al-Biruni and for proposing that the Earth rotates around its axis in the 10th century.
He dedicated work to 'Adud al-Daula, who was probably his patron, and to the prince of Balkh. He also worked in Shiraz making astronomical observations from 969 to 970.