Nikon Wednesday 2014: #31

[peteraitch]

<p>Dieter,</p>

<blockquote>

<p>Wikipedia claims it can be witnessed 100 days per year - but I can't recall having seen such a halo before.</p>

</blockquote>

<p>You need to move to Antarctica! The same physics gives rise to the "Moon Halo", which is perhaps somewhat more familiar. Don't forget the astronomers' favourite - noctilucent clouds, which are also caused by ice, but much higher up and which remain something of a mystery.</p>

<p>Nice capture - they really aren't that common in more temperate regions.</p>

[Brad Cloven]

<p><img src="http://d6d2h4gfvy8t8.cloudfront.net/17824232-md.jpg" alt="" width="495" height="680" /> <p> $10.00 1982 Nikon FE; $25.00 Nikkor 24mm f2.8 N.C. AI'd. Fuji Velvia. 3+ Minute exposure, per the FE.</p>

<p> </p>

[lex_jenkins]

<p>Thanks for clarifying the difference between the 22° halo and sun dogs. I've never seen either, but the farthest north I've been in winter was North Dakota.</p>