The object's apparent brightness yields the distance; its redshift yields the velocity.

这些天体的视亮度可以得到距离，它们的红移可以得出速度。

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The distance to such an object can be worked out by comparing its apparent brightness with its known, absolute brightness.

经过比较表观亮度和已知的绝对亮度，即可得出该天体和我们的距离。

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Deferring to historical custom, astronomers, measure the apparent brightness of stars through the magnitude scale, a very confusing way.

按照历史习惯，天文学家用星等标这种容易使人混淆的方法来度量恒星的视亮度。

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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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