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doi: 10.1038/078367b0
THERE can, I think, be no doubt that the numerous descriptions which have appeared of the recent twilight phenomena relate to essentially the same phenomenon as the “sky-coloured clouds”, or, as the late O. Jesse called them, the “luminous night-clouds”. On June 30 and July 1, which seem to have been the principal dates, I was unfavourably situated for observing the phenomenon, but I may point out that I directed attention to it in your issue of June 11, p. 127.
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