the fainter of the two stars that constitute a double or binary star
the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux
the particular appearance presented by the moon or a planet at a given time
a zodiacal constellation between Gemini and Aries, containing the bright star Aldebaran also called the Bull
the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major
the obscuring of the light of the moon by the intervention of the earth between it and the sun, a lunar eclipse, or the obscuring of the light of the sun by the intervention of the moon between it and a point on the earth, a solar eclipse