Difference between revisions of "Tangent arcs"

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<div class="definition"><div class="short_definition">A [[halo]] in the form of an arc tangent to a circular halo.</div><br/> <div class="paragraph">The most common of these are the upper and lower tangent arcs to the [[halo of 22&deg;]]. They form  separate arcs when the sun is low, but as the sun climbs they join to produce the [[circumscribed  halo]]. These arcs are explained by [[refraction]] through the 60&deg; prism sides of columnar crystals  oriented with their long axes horizontal. <br/>''See'' [[46&deg; lateral arcs]].</div><br/> </div>
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<div class="definition"><div class="short_definition">A [[halo]] in the form of an arc tangent to a circular halo.</div><br/> <div class="paragraph">The most common of these are the upper and lower tangent arcs to the [[halo of 22&#x000b0;]]. They form  separate arcs when the sun is low, but as the sun climbs they join to produce the [[circumscribed  halo]]. These arcs are explained by [[refraction]] through the 60&#x000b0; prism sides of columnar crystals  oriented with their long axes horizontal. <br/>''See'' [[46&#x000b0; lateral arcs]].</div><br/> </div>
 
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Revision as of 16:16, 20 February 2012



tangent arcs

A halo in the form of an arc tangent to a circular halo.

The most common of these are the upper and lower tangent arcs to the halo of 22°. They form separate arcs when the sun is low, but as the sun climbs they join to produce the circumscribed halo. These arcs are explained by refraction through the 60° prism sides of columnar crystals oriented with their long axes horizontal.
See 46° lateral arcs.