[Tig] Moon dogs

Kevin Wheatley hxpro at cinesite.co.uk
Wed Jul 15 09:17:34 BST 2009

Richard Kirk wrote:
> You can get little ticks on either side of the moon due to diffraction by
> hexagonal ice crystals very high in the atmosphere. There are called 'Moon
> dogs'. There are rarer cases where ice forms in different shapes and can
> give you bright spots in other places.

The Astronomy Picture of the Day had an example recently:



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