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Anticrepuscular rays are crepuscular rays that form exactly opposite of the setting or rising sun. They appear as beams of light emerging from the darkened horizon. They are much harder to spot than crepuscular rays, but are likely present if crepuscular rays are also present. They form as a result of light traveling around the curvature of the Earth. An analogy from the site Atmospheric Optics uses a road to symbolize the light coming from the sun to explain how these rays form: "Think of a long straight road, it converges towards the horizon but turn around and it also converges to the opposite horizon. Crepuscular and anticrepuscular rays behave in the same way."
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