Image:LunarIceHalos.jpg

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[edit] Summary

This photo of ice halos around the moon illustrates a number of relatively uncommon phenomena. First, the 22 degree halo itself (which is relatively common) as well as "parhelia" (moondogs) to the sides (the left one was hidden). A upper tangent arc appears tangent to and above the 22 degree halo, and finally a "parhelic circle" (although lunar, not solar) passes through the moondogs and the moon. Parhelia, upper tangent arcs, and parhelic circles are 73, 27, and 4 percent as common as 22 degree arcs, so this is a somewhat unusual event.

Even though this photograph was taken at nighttime, some color is visible in the arcs. Joseph N. Hall

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. Subject to disclaimers.

This work is licensed under the Creative Commons Attribution 2.5 License.

You may select the license of your choice.

The license above applies to this photograph at this resolution or smaller. Joseph N Hall 00:17, 1 September 2006 (UTC)

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	Date/Time	Dimensions	User	Comment
current	00:13, 1 September 2006	640×443 (36 KB)	Joe n bloe (Talk \| contribs)	(This photo of ice halos around the moon illustrates a number of relatively uncommon phenomena. First, the 22 degree halo itself (which is relatively common) as well as "parhelia" (moondogs) to the sides (the left one was hidden). A upper tangent arc appea)