Anticrepuscular rays

Anticrepuscular rays are essentially parallel, but appear to converge toward the antisolar point, the vanishing point, due to a visual illusion from linear perspective.

[2][3] Anticrepuscular rays are most frequently visible around dawn or dusk.

[4] A common example of a single anticrepuscular ray is provided by the shadow of a mountain at sunset, when viewed from the summit.

It appears to be triangular, whatever the shape of the mountain, with the apex at the antisolar point.

[4] Media related to Anticrepuscular rays at Wikimedia Commons

Anticrepuscular rays toward the eastern horizon, as seen from Colorado at dusk
These anticrepuscular rays appear to converge at the antisolar point , as seen from an aircraft above the clouded ocean.
Panoramic image showing both crepuscular and antisolar rays
A "wagon-wheel spokes" double rainbow with anti-crepuscular rays, Hurunui, New Zealand