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Johann Stabius left Ingolstadt in 1497 and took up his residence in Vienna as professor of mathematics; he became court astronomer to the Emperor. Dürer made geographical works for him.
In the corners are four astronomers: Aratus Cilis, Ptolemaeus Egyptius, Manilius Romanus, Azophi Arabus. Above the upper border line in Gothic lettering: Imagines coeli Septentrionales cum duodecim imaginibus zodiaci.
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