Antisolar rays are sometimes seen in the direction opposite the sun, converging to the antisolar point (towards the shadow of your head). They are caused by sunlight being scattered from aerosols like dust particles and water vapor. Clouds or terrain may block the sun in some places, which causes rays of light to become visible. The rays are all parallel to eachother, because the sun is very far away. However, perspective causes the rays seemingly to diverge from the sun's position, or, in the case of antisolar rays, converge to the point opposite the sun (antisolar point).
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