apparent magnitude

基本解释

The magnitude scale now runs to more than six and less than one, even descending into negative numbers —the brightest star in the night sky is Sirius, with an apparent magnitude of -1.46.
现在星等的取值范围已经多过六等，低于一等，甚至下降到负值——夜空中最亮的星是天狼星，它的可视星等为-1.46。
In its testing, the particles burn with an apparent magnitude of –1, which should ensure they're clearly visible in the night sky, even in the polluted skyline of a metropolis like Tokyo.
在测试中，粒子燃烧时可以达到-1的视星等，足以在夜晚的天空中清晰看到，即使在东京这样污染严重的城市里。
A formula used to determine the upper cut off Rc of the fractal structure of the Universe is given by analysis of different apparent magnitude limited catalogues.
本文给出了用几种达到不同极限星等的星系表确定宇宙分形结构上限截止尺度的公式。

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It is similar to a Hertzsprung-Russell (HR) diagram but the latter plots luminosity (or absolute magnitude) rather than just apparent brightness and a knowledge of the distances of the stars plotted is also needed.
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