Pasachoff, Jay M. Hopkins Observatory, Williams College, Williamstown, Massachusetts.
The Twins, a winter zodiacal constellation (see illustration). It is marked by a pair of bright stars, Castor and Pollux, usually pictured in the heads of the twins. This pair is easy to pick out with the unaided eye since they are of similar brightness and are separated by less than a fist's width when held at the end of the observer's outstretched arm. See also: Zodiac
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