Albrecht Dürer, Northern Hemisphere Star Map. The four corners of the northern hemisphere map contain portraits of astronomer/astrologers: Top left Aratus 4th century BCE author of the Pænomena an astronomical poem. Top right is Ptolemaeus. Bottom left is Manilius a 1st century CE Roman astrologer, whose astrological poem Astronomica Regiomontanus had published in Nürnberg in 1473. Bottom right is the 10th century CE Persian astronomer al-Sufi, author of a famous star catalogue.