halo of 46°

halo of 46°

[′hā·lō əv ¦fȯrd·ē′siks di′grēz]
(optics)
A halo phenomenon in the form of a prismatically colored circle or incomplete arc thereof, centered on the sun or moon and having an angular radius of about 46°; the coloration is red on the inner edge to blue on the outer edge.