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A moon dog, moondog, or mock moon,〔(【引用サイトリンク】url=http://www.collinsdictionary.com/dictionary/english/paraselene )〕 (scientific name paraselene,〔 plural ''paraselenae'', meaning "beside the moon") is a relatively rare bright circular spot on a lunar halo caused by the refraction of moonlight by hexagonal-plate-shaped ice crystals in cirrus or cirrostratus clouds. Moondogs appear as ~22 degree radius halo around the moon (see: wiki on 22 degree halo), ...compare halo size to half degree size of moon. They are exactly analogous to sun dogs, but are rarer because to be produced the moon must be bright, about quarter moon or more. Moondogs show little color to the unaided eye because their light is not bright enough to activate the cone cells of the human eye. ==See also== * Sun dogs * Halo (optical phenomenon) * 22° halo * Moon ring 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Moon dog」の詳細全文を読む スポンサード リンク
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