Gemini (Latin: twins, symbol , Unicode ♊) is one of the constellations of the zodiac known as "the twins". It is part of the winter sky, lying between Taurus to the west and the dim Cancer to the east, with Auriga and the near-invisible Lynx to the north and Monoceros and Canis Minor to the south. The Gemini program is named for it.
The stars of the constellation Gemini can be connected in an alternative way, which graphically shows a pair of twins holding hands.
The twin to the right is Castor, whose brightest star is alpha Geminorum (more commonly called Castor), is of the second magnitude, and represents Castor's head. The twin to the left is Pollux, whose brightest star is beta Geminorum (more commonly called Pollux), is of the first magnitude, and represents Pollux's head.
Pollux's torso is represented by star upsilon Geminorum, Pollux's right hand by iota Geminorum, Pollux's left hand by kappa Geminorum: all three of these stars are of the fourth magnitude.
Pollux's pelvis is represented by star delta Geminorum, Pollux's right knee by zeta Geminorum, Pollux's right foot by gamma Geminorum, Pollux's left knee by lambda Geminorum, and Pollux's left foot by xi Geminorum. Gamma Geminorum is of the second magnitude, while delta and xi Geminorum are of the third magnitude.
Castor's torso is represented by the star tau Geminorum, Castor's left hand by iota Geminorum (which he shares with Pollux), Castor's right hand by theta Geminorum: all three of these stars are of the fourth magnitude.
Castor's pelvis is represented by the star epsilon Geminorum, Castor's left foot by nu Geminorum, and Castor's right foot by mu Geminorum and eta Geminorum: epsilon, mu, and eta Geminorum are of the third magnitude.
The twin to the right is Castor, whose brightest star is alpha Geminorum (more commonly called Castor), is of the second magnitude, and represents Castor's head. The twin to the left is Pollux, whose brightest star is beta Geminorum (more commonly called Pollux), is of the first magnitude, and represents Pollux's head.
Pollux's torso is represented by star upsilon Geminorum, Pollux's right hand by iota Geminorum, Pollux's left hand by kappa Geminorum: all three of these stars are of the fourth magnitude.
Pollux's pelvis is represented by star delta Geminorum, Pollux's right knee by zeta Geminorum, Pollux's right foot by gamma Geminorum, Pollux's left knee by lambda Geminorum, and Pollux's left foot by xi Geminorum. Gamma Geminorum is of the second magnitude, while delta and xi Geminorum are of the third magnitude.
Castor's torso is represented by the star tau Geminorum, Castor's left hand by iota Geminorum (which he shares with Pollux), Castor's right hand by theta Geminorum: all three of these stars are of the fourth magnitude.
Castor's pelvis is represented by the star epsilon Geminorum, Castor's left foot by nu Geminorum, and Castor's right foot by mu Geminorum and eta Geminorum: epsilon, mu, and eta Geminorum are of the third magnitude.
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