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How many stars were listed in Ptolemy’s star catalog?
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Ptolemy
Ptolemy's theory of the solar system.
Ptolemy’s star catalog, which is contained within his seminal work the Almagest, lists 1,022 stars.12
These stars are organized into 48 constellations. While this catalog was heavily influenced by the earlier work of the astronomer Hipparchus—who is credited with the first known star catalog containing approximately 850 stars—Ptolemy’s version included additions and modifications that remained the authoritative reference for astronomers until the Renaissance.234