Jisho

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Noun
1. double star; visual doubleAstronomy
Wikipedia definition
2. Double starIn observational astronomy, a double star is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope. This can happen either because the pair forms a binary star, i.e. a binary system of stars in mutual orbit, gravitationally bound to each other, or because it is an optical double, a chance alignment of two stars in the sky that lie at different distances.
Read “Double star” on English Wikipedia
Read “二重星” on Japanese Wikipedia
Read “Double star” on DBpedia

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