Bouguer's halo

Bouguer's halo

[bu̇′gerz ′hā‚lō]
(meteorology)
A faint, white circular arc of light of about 39° radius around the antisolar point. Also known as Ulloa's ring.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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