companion star

companion star

noun Astronomy.
companion1 (def. 6).

Origin:
1775–85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Companion star is always a great word to know.
So is Leo. Does it mean:
the Lion, a zodiacal constellation between Virgo and Cancer, containing the bright star Regulus
the angular distance of a heavenly body above the horizon
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