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WikiPedia: Hào quang 46° http://www.meteoros.de/arten/ee12e.htm http://www.meteoros.de/arten/ee21e.htm http://www.atoptics.co.uk/halo/46form.htm http://www.atoptics.co.uk/halo/46orsup.htm https://books.google.com/books?id=y10O12JjHskC&pg=... https://web.archive.org/web/20070331081342/http://...