apparent brightness

基本解釋

The object's apparent brightness yields the distance; its redshift yields the velocity.
這些天體的視亮度可以得到距離，它們的紅移可以得出速度。
That unexpected finding was the result of studies of supernovas whose apparent brightness (and therefore distance) did not match the previous theory.
這個出乎意料的發(fā)現(xiàn)是因為發(fā)現(xiàn)超新星的亮度（表示距離）和以前的理論不相符。
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.
當觀察擴展光源時，目鏡中所看到的亮度只跟孔徑和放大率有關，它跟焦比并沒有關系。

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.
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