May 1872
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1872natur...6....5i&link_type=abstract
Nature, Volume 6, Issue 131, pp. 5 (1872).
Physics
Scientific paper
THIS morning, at 9.20, I observed a strongly-marked halo round the sun. Roughly extemporising a sextant with a postcard and paper-vector, I took three observations on the semi-diameter, and found the mean to be 22° 6. So I conclude this to be the ice-halo, whose deviation is 23°, being formed of hexagonal crystals. Two facts render the halo noteworthy-(1) the morning (after a heavy gale from the south) was exceptionally warm ; (2) the halo exhibited the extreme colours in the proper order. I am told halos do not exhibit colours. Surely they ought to; and if not, why not ? Let some of your readers answer me this. The halo was visible till nearly 10 o'clock.
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