Al-Sijzi

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.

This article is about the Iranian scientist astronomer. For the Indo-Persian Sufi poet, see Hasan Sijzi.
For other people named Al-Sijistani, see Al-Sijistani.
Abu Sa'id al-Sijzi
A page from Al Sijzi's geometrical treatise
Born945 CE
Sijistan, Saffarid dynasty (modern-day Sistan)
Died1020 CE
Main interests
Mathematics, Astronomy, Astrology

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.

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