#anticrepuscular ray

[meme-xx]

Rainbow, anticrepuscular ray, and swirling cloud (Aug. 22, 2020)

[wigmund]

From Earth Science Picture Of The Day; April 18, 2014:

Rainbow Fragment and Anticrepuscular Rays Photographer: Thalia Trainaou; Summary Authors: Thalia Traianou; Jim Foster

The photo above showing a fragment of a rainbow and set of anticrepuscular rays was captured at sunset from the campus of the Aristotle University of Thesaloniki, Greece. If the complete primary rainbow were observed these anticrepuscular rays would appear to fan out from the center of the bow -- a rainbow wheel. In this case, though the camera is still at the anitisolar point, the rays look parallel since only the ones near the horizon are visible. Note that this view is toward the eastern horizon, but the rays actually extend all away across the sky to the western horizon.

[wigmund]

From Earth Science Picture Of The Day; March 9, 2014:

Anticrepuscular Rays Over Reunion Island Photographer: Luc Perot; Summary Authors: Luc Perot, Jim Foster

The photo above shows a wonderful display of anticrepuscular rays as observed from Reunion Island on the evening of January 15, 2014. The nearly full Moon is rising amidst the rosy rays, with the Belt of Venus. Anticrepuscular rays are simply an extension of crepuscular rays. If the air is sufficiently clean and clear and the crepuscular rays sufficiently distinct, rays can be seen fanning out on both sides of the sky -- on opposite horizons. In actuality, the lanes of light and shadow are parallel to each other; perspective makes them appear otherwise.