Abu Sa'id Ahmed ibn Mohammed ibn Abd Jalil Sijzi (short for Sijistani) (Persian: ابوسعید سجزی‎) was a Persian astronomer and mathematician from Sistan, a region lying in the south-west of Afghanistan and south-east of Iran.

Sijzi is thought to have been born around 945 CE, and lived through about 1020. His main scientific focus was astronomy. He had a deep knowledge of literature which he used to his advantage. He dedicated work to 'Adud al-Daula and the prince of Balkh. He also worked in Shiraz making astronomical observations from 969 to 970. He also did a lot of geometry work.

Read more about SijziAstronomy, Mathematics

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Cosmology In Medieval Islam - Cosmology in The Medieval Islamic World - Early Heliocentric Models
... by al-Hashimi, Abū Rayhān al-Bīrūnī and al-Sijzi ... Al-Biruni also wrote that al-Sijzi also believed the Earth was moving and invented an astrolabe called the "Zuraqi" based on this idea "I have seen the ...
Sijzi - Mathematics
... Sijzi was a mathematician who made a special study of the intersections of conic sections and circles ...
Mas‘ud Ibn Muhammad Sijzi
... Mas‘ud ibn Muhammad Sijzi was a Persian physician who lived before 1334CE in eastern Iran ... Little is known of the life of Mas‘ud ibn Muhammad al-Sijzi, only that he must have been working sometime before 1334CE ...