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'Abd Al-Rahman Al Sufi
He lived in Isfahan, Persia, and worked on translating and expanding Greek astronomical works, especially the Almagest of Ptolemy. He contributed several corrections to Ptolemy's star list and did his own brightness and magnitude estimates which frequently deviated from those in Ptolemy's work. He was the first to attempt to relate the Greek with the traditional Arabic star names and constellations, which were completely unrelated and overlapped in complicated ways.
He observed that the ecliptic plane is inclined with respect to the celestial equator and more accurately calculated the length of the solar year. He observed and described the stars, their positions, their magnitudes (brightness) and their colour, setting out his results constellation by constellation. For each constellation, he provided two drawings, one from the outside of a celestial globe, and the other from the inside (as seen from the sky). Al Sufi also wrote on the astrolabe, finding numerous additional uses for it.
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