Earth photos

Antirepuscular light. Earth's sky

Antirepuscular light. Earth's sky

Although the scene may seem at some supernatural moment, nothing more normal is happening than a sunset and well placed clouds.

The photograph shows antirepuscular rays. To understand them, start by imagining common crepuscular rays that are seen when the sun's rays pass through the cut clouds. Now, although the sun's rays travel in a straight line, their projections in the celestial sphere are large circles.

Thus, the crepuscular rays of a setting (or rising) of the Sun will appear to re-converge on the other side of the sky. On the other side of the sky, 180 degrees from the Sun, they are therefore called antirepuscular rays.

The image that can be seen above is photographed from a moving car just outside Boulder, Colorado, USA.

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