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A comment on Earth actually has two moons.. Parent comment
In any case, we do say that a "sun around a black hole" is a "binary star system". See http://www.sciencedaily.com/releases/2011/03/110325082725.ht... and http://chandra.harvard.edu/photo/category/blackholes.html for two examples of many web pages which use that terminology. From a caption at the chandra.harvard.edu site:
"A binary star system consisting of a black hole and a normal star, located about 11,000 light years from Earth."
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In any case, we do say that a "sun around a black hole" is a "binary star system". See http://www.sciencedaily.com/releases/2011/03/110325082725.ht... and http://chandra.harvard.edu/photo/category/blackholes.html for two examples of many web pages which use that terminology. From a caption at the chandra.harvard.edu site:
"A binary star system consisting of a black hole and a normal star, located about 11,000 light years from Earth."