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Gemini is one of the 48 ancient constellations recorded by Ptolemy. It represents the twins Castor and Pollux, and its brightest (first-magnitude) stars, which represent the heads of the twins, are therefore called Castor and Pollux.
Historical Map of Gemini
(to be added in the next iteration of this page)
Modern Map of Gemini
Modified version of Wikimedia Commons map by Torsten Bronger
Constellations Bordering Gemini
(to be added in the next iteration of this page)
Stars in Gemini
Stars that have common names often have multiple names, so the common names shown (if any) cannot be considered authoritative. Right ascension and declination are given in 2000.0 coordinates.
α Gem (Castor)
β Gem (Pollux)
γ Gem (Alhena)
δ Gem
ε Gem
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