在被称为曙暮辉的太阳光线的照射下，它们实际上是由靠近遥远的西方地平线的云层产生的阴影，此时落日在云层的正后方渐渐隐去。
Outlined by rays of sunlight known as crepuscular rays, they are actually shadows cast by clouds near the distant western horizon, the setting sun having disappeared from direct view behind them.
一只沐浴在曙暮辉中来自法国南部的蝴蝶。
在距离太阳180度的对日点它们便被称为反曙暮辉。 上图就是一张特别明亮的反曙暮辉图。
At the anti-solar point 180 degrees around from the Sun, they are referred to as anticrepuscular rays.
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