Misplaced Pages

Crepuscular rays

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Sunbeams that originate when the Sun appears to be just below the horizon
Sunlight shining through clouds, giving rise to crepuscular rays over Lake Hāwea, New Zealand

Crepuscular rays, sometimes colloquially referred to as god rays, are sunbeams that originate when the Sun appears to be just above or below a layer of clouds, during the twilight period. Crepuscular rays are noticeable when the contrast between light and dark is most obvious. Crepuscular comes from the Latin word crepusculum, meaning "twilight". Crepuscular rays usually appear orange because the path through the atmosphere at dawn and dusk passes through up to 40 times as much air as rays from a high Sun at noon. Particles in the air scatter short-wavelength light (blue and green) through Rayleigh scattering much more strongly than longer-wavelength yellow and red light.

Loosely, the term crepuscular rays is sometimes extended to the general phenomenon of rays of sunlight that appear to converge at a point in the sky, irrespective of time of day.

A rare related phenomena are anticrepuscular rays which can appear at the same time (and coloration) as crepuscular rays but in the opposite direction of the setting sun (east rather than west).

Gallery

See also

  • Earth's shadow – Shadow that Earth itself casts through its atmosphere and into outer space
  • Foreglow – Whitish or rosy light during twilight or after sunsetPages displaying short descriptions of redirect targets

References

  1. Naylor, John (2002). Out of the Blue: A 24-Hour Skywatcher's Guide. Cambridge University Press. pp. 77–79. ISBN 9780521809252.
  2. Edens, Harald. "Crepuscular rays". weatherscapes.com. Retrieved 2011-11-01.
  3. "Crepuscular Rays". 16 September 2023.
  4. "Weather Facts: Crepuscular rays | weatheronline.co.uk".

External links

The Sun
Internal structure
Atmosphere
Photosphere
Chromosphere
Corona
Variation
Heliosphere
Related
Spectral classG-type main-sequence star
Exploration


Stub icon

This optics-related article is a stub. You can help Misplaced Pages by expanding it.

Stub icon

This article related to the Sun is a stub. You can help Misplaced Pages by expanding it.

Categories: