An ice crystal halo around the waxing gibbous Moon set in the winter stars of a January night. The 22° halo is most obvious and with a reddish and sharply defined inner rim and a bluish and more diffuse outer edge. But a faint 8° halo is also visible,a rare halo sometimes called the Van Buijsen Halo (according to Lynch and Livingston in their book Color and Light in Nature; Minnaert also mentions it in his seminal book The Nature of Color and Light in the Open Air). It is not a lens flare as shots taken with the Moon well off to one side of the frame still show the inner halo centred on the Mo

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