Anticrepuscular/Antisolar Rays imaged near Cape Town, South Africa by Jonathan Shock.   The rays converge towards the shadow of his camera.  ©Jonathan Shock, shown with permission


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Anticrepuscular rays and shadows might better be called antisolar rays. They appear to converge towards the antisolar point directly opposite the sun and usually below the horizon.

In reality they are parallel shafts of light or shadow crossing the sky.   Instead, perspective makes them them appear to cross the celestial sphere in arcs intersecting the sun and antisolar points.

The shadow producing objects can be sunward mountains or clouds or they can be clouds in the sky opposite the sun, it does not matter.