apparent brightness

The corresponding concept for apparent brightness is generally called a number count.

而视亮度的相应概念通常叫作计数。

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

通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。

Optical flow field is referred to the apparent motion of image brightness patterns. It can be obtained by adding constraints to solve the optical flow constraint equation.

光流场是指图像亮度模式的表观运动，可以通过添加限制条件来求解光流约束方程来获得。

By gauging the redshift and apparent brightness of a large number of supernovae located at a variety of distances, researchers can create a record of the universe's expansion.

藉由调校大量位于不同距离的超新星红移和表观亮度，研究人员可造出一组宇宙膨胀的记录。

Since the speed of light is constant, knowing how far away such a "standard candle" is ( calculated from its apparent brightness seen from Earth) is to know how long ago it exploded.

再加上光速是恒定的，知道这样一盏“标准蜡烛”离地球多远（根据地球上观测的视觉亮度计算得出）就能知道它是多久以前爆发的。

Let all the apparent darkness hides in brightness and glitters.

把看起来的黑暗,都隐藏在光明与灿烂之中.

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。