Visible Stars可见的恒星
How many stars can you see? There are about 6000 stars which are visible with the unaided human eye, so at any given time you can see a maximum of about 3000 stars. The apparent luminosity necessary for unaided viewing is about magnitude +6. 你能看到多少颗星？大约有6000颗星可以用肉眼看到，因此在任何给定的时间内，你最多能看到约3000颗星。肉眼可见的视亮度约为+6等。
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Index Star concepts Reference Kaufmann Ch. 2 索引 星体概念 参考文献 Kaufmann 第2章 | ||
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