Eudoxus of Cnidus
His chief work, the "Sphaerics" (), provided the mathematics for spherical astronomy, and may have been based on a work by Eudoxus of Cnidus. It is reasonably complete, and remained the main reference on the subject at least until the time of Pappus of Alexandria (4th century AD). The work was translated into Arabic in the 10th century, and then into Latin in the early 16th century, but these versions were faulty. Francesco Maurolico translated the works later in the 16th century.