Abstract
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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INGLEBY, C. Solar Halo. Nature 6, 5 (1872). https://doi.org/10.1038/006005b0
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DOI: https://doi.org/10.1038/006005b0
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