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V
Yeah, suppose we know the magnitude of all the stars and that the number of binary systems is k (can be one or more).
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How do we calculate the magnitude of a system composed by some binary systems of stars?
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Hahahahaha. I know it, but I want a more specified answer. One of the options is In the direction of the vernal equinox...
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In South Pole, In which direction will the sun rise?