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Many people have seen crepuscular rays. They’re rays of light typically seen streaming from clouds, radiating back towards the Sun. These rays are actually parallel, but because of perspective effects they seem to radiate from a single point in the sky.

Not many people have seen anticrepuscular rays, which are formed by essentially the same process as crepuscular rays — shadows cast from clouds in the Earth’s atmosphere. However, they’re typically only seen at sunrise, and they’re much fainter than crepuscular rays.

The above picture (click for larger sizes) was taken just before sunrise in Hilo, Hawaii. The coming sun signals a beginning and an end for the terrestrial subjects of the picture — the start of the day means Hilo wakes up, and the end of the night means the telescopes on Mauna Kea close up.