Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 712
e adjustment of orientation, the pro-portion of those, thus favorably situated must very rapidly HALOS. 701 decrease with increasing angular distances from the sun.These considerations lead us to expect a sudden increase inthe luminosity of the skv, when such crystals are abundant,at a distance of… … Fig. 455. The dihedral angle of 90°, formed by the sides and basesof the hexagonal prisms, also produces a circular halo in asimilar manner, but of 46° radius. This is necessarily muchfainter than the 22° circle, and is in fact very infrequent. The other phenomena, some of which are represented…
Physics
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