isoluminance curve

例句：

1. 1.The isoluminance curve of the sun is used to determine its position in the sky.
   太阳的光亮度曲线被用来确定它在天空中的位置。
2. 2. This graph shows the isoluminance curve of the moon during a full moon phase.
   这个图表显示了满月期间月亮的光亮度曲线。
3. 3. The isoluminance curve of the sun's light is measured by scientists to study the Earth's atmosphere.
   科学家通过测量太阳光的亮度曲线来研究地球的大气层。