EPOD - a service of USRA
The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.
Anticrepuscular Rays at the Winter Sunset
April 05, 2022
Raggi Anticrepuscolari Teresa Molinaro
Photographer: Teresa Molinaro
Summary Authors: Teresa Molinaro; Cadan Cummings
The magical golden hour following sunset brings about many vistas
including times when the eastern sky is filled with anticrepuscular
rays. These sunbeams occur on the opposite horizon from the Sun and
appear to converge towards the antisolar point. Anticrepuscular
rays typically accompany crepuscular rays that appear on the
opposite horizon. Both atmospheric ray phenomena are produced when
incoming sunlight is partially blocked by clouds or a tall landform and
are accentuated when dust, smoke or other particulates are in the air.
Although the anticrepuscular rays appear to converge at the antisolar
point, the sunbeams are actually parallel in the atmosphere and
this optical effect is caused by the viewer’s perspective.
The photo above was taken on December 22, 2021, at around 4:50PM local
time. That evening, I found myself observing the sea just as the Sun
had set behind me. To my surprise, these soft but unmistakable
anticrepuscular rays radiated into the sky. In addition, an orange and
pink hue produced by Belt of Venus is also faintly visible on the
eastern horizon.
Photo details: Nikon D3400, 1/160 second exposure, f/10, ISO-400
* Bagheria, Sicily, Italy Coordinates: 38.083, 13.500
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More...
Cloud Links
* Atmospheric Optics
* The Cloud Appreciation Society
* Cloud Atlas
* Color and Light in Nature
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Earth Science Picture of the Day is a service of the Universities
Space Research Association.
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