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Old 20-08-2005, 09:01 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,820
Lunar halo - 19 Aug 2005

Hello

Last night I set up my new C9.25 to try some Lunar imaging with my LPI and was lucky enough to capture this Lunar halo with a consumer digital camera.

Explanation from Dr Charles Wood of LPOD fame at http://www.lpod.org/archive/2004/06/LPOD-2004-06-03.htm

"The ring is made of Moon light that is refracted (bent) as it passes through an ice crystal. Moon rings only occur if there are relatively high (and thus cold with ice crystals) wispy clouds. The common hexagonal shaped crystals bend the light by 22 degrees (two fist widths, if you want to measure it), so the entire ring is 44 degrees wide".

Cheers

Dennis
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