Aug 1888
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1888natur..38..414b&link_type=abstract
Nature, Volume 38, Issue 983, pp. 414 (1888).
Physics
Scientific paper
I HAVE never before seen the phenomenon of sun columns in such splendour as on the 11th inst. The day was very hot, the wind a pretty stiff westerly one, and the sky perfectly cloudless. After sunset, which (according to the calendar) took place at 7h. 27m. p.m., several sun columns became visible. They were seen to grow in length, and at 7h. 40m. they extended over the whole sky. The columns were five in number, and pretty regularly distributed, so that one passed through the zenith, two on the north, and two on the south of it at equal distances. A very small cloud was visible at that time in the west-north-west. The colour of the shades was dark blue, and their width in the zenith from 2° to 4°. The lighted parts of the sky had a pale violet colour. The rays extended over the whole sky like meridians on a globe, and all five columns were seen to meet in one point in the east-south-east, about 5° above the horizon. The phenomenon could be seen well in all its extension, as I watched it from a hill 688 metres above the sea-level. The intensity of the colour of the colmns was at its highest at 7h. 45m. (Prague local time), and it disappeared at 7h. 50m.
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