A Zenith Halo

Details A Zenith Halo A Zenith Halo

Jun 1911

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1911natur..86..448v&link_type=abstract

Nature, Volume 86, Issue 2170, pp. 448 (1911).

Physics

Scientific paper

WITH reference to Mr. Gold's letter in your issue of May 11 concerning the halo observed by Mr. Kreyer, I should like to make the following remarks. I think Mr. Gold is quite right in assuming that the phenomenon observed was the so-called arc of contact of the halo of 46° radius, which for this altitude of the sun is really almost in contact with that halo, whereas, according to Bravais's theory, supported by numerous observations by Ekama and Besson, for lower altitudes these arcs may be separated by as much as 7° (with the sun at the horizon even 12°). But I think Mr. Gold is mistaken in assuming that the centre was at 80°, or 85° altitude.

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