apparent brightness

基本解释

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。
That unexpected finding was the result of studies of supernovas whose apparent brightness (and therefore distance) did not match the previous theory.
这个出乎意料的发现是因为发现超新星的亮度（表示距离）和以前的理论不相符。
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。

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.
ENGADGET: 9-gigapixel image of the Milky Way reminds us just how small we truly are