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The primary rainbow is caused by a single reflection from raindrops. It will be highest at 42° above the shadow
of your head. The secondary rainbow has the colors reversed and is caused by a double reflection from raindrops. It will
be highest at 52° above the shadow of your head.
Boyer, C. B. The Rainbow from Myth to Mathematics. Princeton, NJ: Princeton University Press, 1987.
Corliss, W. R. Rare Halos, Mirages, Anomalous Rainbows and Related Electromagnetic Phenomena: A Catalog of Geophysical Anomalies.
Glen Arm, MD: Sourcebook Project, 1984.
Gallant, R. A. Rainbows, Mirages, and Sundogs: The Sky As a Source of Wonder. New York: Atheneum, 1987.
Greenler, R. Rainbows, Halos, and Glories. Cambridge, England: Cambridge University Press, 1980.
© 1996-2007 Eric W. Weisstein
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