視星等

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視星等

視星等係人類用肉眼觀察可以睇到嘅恆星光度,最初將可以睇到嘅星分做一等星到六等星,後尾用對數比例,將每等星光度差距固定做2.512倍,就算光度高過1或者低過6都有數得計。

原神星同另外兩粒星嘅視星等

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