His Almagest was widely read by medieval Arabic astronomers in the centuries after his death.

Ptolemy's authority was preferred by most Astronomy in medieval Islam and late medieval European astronomers.

Several different variations of the instrument were later produced by medieval Muslim astronomers.

Ptolemy's authority was preferred by most medieval Islamic and late medieval European astronomers.

Andalò del Negro (Genoa, 1260 - Naples, 1334) was a medieval Italian astronomer and geographer.

Golagrama is a village or region in India associated with several medieval Indian astronomers, astrologers and mathematicians.

Several medieval Indian astronomers and mathematicians are known to have flourished in Golagrama.

They were a kind of speciality of medieval Muslim astronomers to whom the credit of building the first mural sextants is attributed.

For medieval Islamic astronomers, there was an obvious challenge to find a simpler trigonometric method.

He introduced a number of trigonometric relations, and his Kitāb az-Zīj was frequently quoted by many medieval astronomers, including Copernicus.