Circles in the Sky


	Circles in the Sky

grammydjb1

5-16-2008 4:47 PM

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tags:

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/7badbf23-30b3-4bf8-ab8b-5867d03b5df7/5D9879E8-FC9B-4727-B95E-86B7D22D9D05/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://antwrp.gsfc.nasa.gov/apod/astropix.html" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/56943772-95B7-4358-9D69-0100890925C6" alt="See Explanation.  Clicking on the picture will download
 the highest resolution version available." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><P>
<B> Explanation: </B>
Gazing skyward on a sunny day in May,
photographer Jean-Marc Lecleire captured this
<A href="http://astrosurf.com/lecleire/mai2008.html">engaging display</A>
of <A href="http://www.atoptics.co.uk/halosim.htm">ice halos</A>
forming complete circles in the sky.
Recorded with a fish-eye lens from a spot near
the grand
<A href="http://en.wikipedia.org/wiki/
Ch%C3%A2teau_de_Chambord">Château de Chambord</A> in France,
the picture looks
straight up, spanning almost 180 degrees from
<A href="http://antwrp.gsfc.nasa.gov/apod/ap071221.html">horizon to horizon</A>.
Surrounding the Sun is a halo
formed by sunlight refracting through
<A href="http://antwrp.gsfc.nasa.gov/apod/ap061109.html">hexagonal-shaped</A> ice crystals in
high, thin clouds.
The halo is circular and exactly 22 degrees in radius,
but it looks squashed because of the
<A href="http://wiki.panotools.org/Fisheye_Projection">distortion</A>
of the extremely wide-angle lens.
Surrounding the zenith (the point directly above the observer)
and always at the same altitude as the
Sun is a lovely
<A href="http://www.atoptics.co.uk/halo/pcpaths.htm">parhelic circle</A>,
caused by sunlight
reflecting from ice crystals with nearly vertical faces.
On average more common than rainbows,
beautiful ice halos can often be seen in planet Earth's sky
by those who know
<A href="http://www.atoptics.co.uk/halo/p1.htm">how to look</A>
for them.
</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/5D9879E8-FC9B-4727-B95E-86B7D22D9D05/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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