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。
This is the first study in the world to use the reflection of the Earth to measure the effect of continents and oceans on the apparent brightness of a planet.
这是世界上首次利用地照来研究陆地和海洋对行星表面亮度的影响。在其他研究中，已经使用色谱和红外传感技术来确认植物以及进行气候监测。
When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
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。
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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