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Gemini, "The Twins" was named after a set of twins in mythology, Castor and Pollux.
It was named after the constellation Gemini (twins).
Pollux and Castor
the Greek culture
The Gemini spacecrafts were named after the constellation Gemini since two astronauts were required to operate the spacecraft. Gemini is Latin for "twins," representing the two-man crews that flew the missions.
It was named well before Ptolemy listed it in his Almagest in the second century.
The beta star of Gemini is Pollux. The two bright stars of Gemini are Castor and Pollux. Although Pollux is the brightest star in Gemini, Castor was named alpha-Gemini (despite being second brightest), therefore, Pollux is beta-Gemini. Pollux is the one more southerly and easterly.
n.A constellation in the Northern Hemisphere containing the stars Castor and Pollux. Also called Twins.The third sign of the zodiac in astrology. Also called Twins.pl., -nis. One who is born under this sign.Gemini (the constellation) was named because its shape reminded the Greeks of the mythological twins Castor an Pollux. Consequently, the two brightest stars (aptly named Castor and Pollux) form the heads of each of the twins.Gemini (the NASA space program) was named because the capsule seated two astronauts--twins if you will.
The normal use is the capitalized Gemini. Gemini is an astrological star sign associated with a visible astronomical constellation, which includes the "twin" stars Castor and Pollux. The original Greek was Dioskouroi or Dioscuri, "sons of Zeus", named Kastor and Polydeukes.
Gemini is considered a group of stars making up that particular constellation. It was first used in the ancient Greek myth of Jason and the Argonauts. The two stars Castor and Pollux found within the constellation Gemini are named after characters in this ancient myth.
Gemini is a constellation which represents twins named Castor and Pollux. Castor was mortal and Pollux was immortal. When Castor died, Pollux asked his father Zeus to let him share his immortality with Castor to become the constellation known as Gemini.--from Wikipedia.org
Gemini XII was the last Gemini flight, and occurred on November 11-15, 1966. This was the tenth manned Gemini mission.