Editing Anticrepuscular rays (section)

{{Short description|Meteorological optical phenomenon}}
[[File:Colorado_Anticrepuscular_Rays.jpg|thumb|Anticrepuscular rays toward the eastern horizon, as seen from Colorado at dusk]]
[[File:Anticrepuscular rays from above.jpg|thumb|right|These anticrepuscular rays appear to converge at the [[antisolar point]], as seen from an aircraft above the clouded ocean.]]
[[File:Crepuscular rays over Paranal Observatory, Chile.jpg|thumb|right|[[panoramic photography|Panoramic image]] showing both [[crepuscular rays|crepuscular]] and antisolar rays]]

'''Anticrepuscular rays''', or '''antisolar rays''',<ref>{{cite web
|url = http://www.atoptics.co.uk/atoptics/anti1.htm
|title = Anti-solar (anti-crepuscular) rays
|first = Les
|last = Cowley
|work = Atmospheric Optics
|accessdate = March 19, 2015
|mode = cs2
}}</ref> are [[meteorological optics| meteorological]] [[optical phenomenon|optical phenomena]] similar to [[crepuscular rays]], but appear opposite the [[Sun]] in the [[sky]]. Anticrepuscular rays are essentially [[parallel (geometry)|parallel]], but appear to converge toward the [[antisolar point]], the [[vanishing point]], due to a [[visual illusion]] from [[linear perspective]].<ref name="cresp">{{cite book
|pages=124–127
|url=https://books.google.com/books?id=0cpQGHqxQBUC&pg=PA124
|author=John A. Day
|title=The Book of Clouds
|year=2005
|publisher=Sterling Publishing Company, Inc.
|isbn=978-1-4027-2813-6
|mode = cs2
}}</ref><ref>{{cite web
|url = http://atoptics.co.uk/fz1113.htm
|title = Antisolar rays
|first = Les
|last = Cowley
|work = Atmospheric Optics
|accessdate = March 19, 2015
|mode = cs2
}}</ref>

Anticrepuscular rays are most frequently visible around [[dawn]] or [[dusk]]. This is because the atmospheric [[light scattering by particles|light scattering]] that makes them visible ([[backscatter]]ing) is larger for low angles to the horizon than most other angles. Anticrepuscular rays are dimmer than crepuscular rays because backscattering is less than [[forward scatter]]ing. 

Anticrepuscular rays can be continuous with crepuscular rays, curving across the whole sky in [[great circle]]s.<ref name="Lynch&1995">Lynch, D. K., & Livingston, W. (1995). Color and light in nature. Cambridge: Cambridge University Press.</ref>