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2a. Detail of the Orion star positions in the star catalog in Ptolemy, Almagestum, 1515.

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This detail shows the last few stars in Ptolemy's catalog of Orion, and the beginning of the entry for Eridanus. In the second line from the top, Ptolemy catalogs the star that will later become known as Rigel. He describes it as "The bright star that is in the left foot in common with the water", gives its longitude and latitude, and assigns a magnitude of "1".