• 1. apparent brightness: 表观亮度 | 视亮度 | 表现亮度 | 表面上的
• 2. apparent t brightness: 视亮度
• 3. apparent sky brightness: 视天空亮度

• 1.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。
  dict.yoduao.com
• 2.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。
  dict.yoduao.com
• 3.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。
  dict.yoduao.com

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