Following Castor through the years
Even a small backyard telescope can reveal the orbital motion of a binary star.
Contributed by Glenn Chaple
Published:
May 23, 2011
 Glenn Chaple's observations with his 3-inch f/10 reflecting telescope at 120x show the position shift of Castor between 1976 (at left) and 2008 (right).
Photo by Glenn Chaple
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