Circumscribed halo: Difference between revisions
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<div class="definition"><div class="short_definition">The descriptive name given to the fully developed 22& | <div class="definition"><div class="short_definition">The descriptive name given to the fully developed 22° [[tangent arcs]] for light- source [[elevation angles]] of between approximately 30° and 75°.</div><br/> <div class="paragraph">At these elevation angles, the upper and lower 22° tangent arcs merge to form a kidney-bean- shaped [[halo]] circumscribing the [[halo of 22°]]. Sometimes the term "circumscribed halo" is misleadingly employed as equivalent to the 22° tangent arcs.</div><br/> </div> | ||
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Latest revision as of 13:50, 20 February 2012
circumscribed halo
The descriptive name given to the fully developed 22° tangent arcs for light- source elevation angles of between approximately 30° and 75°.
At these elevation angles, the upper and lower 22° tangent arcs merge to form a kidney-bean- shaped halo circumscribing the halo of 22°. Sometimes the term "circumscribed halo" is misleadingly employed as equivalent to the 22° tangent arcs.
