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Wet moon : ウィキペディア英語版
Wet moon

A wet moon (also called a Cheshire moon) is a lunar phase when the "horns" of the crescent moon point up at an angle, away from the horizon, so the moon's crescent takes on the appearance of a bowl or a smile. A wet moon occurs when the crescent moon is near the horizon at a point more or less directly above the sun's (invisible) position below the horizon. This in turn is determined by the earth's and moon's positions in their orbits, the inclination of these orbits relative to one another and to the earth's axis, and observer's latitude on the earth. Wet moons occur routinely in the tropics (where the sun and moon rise and set nearly vertically), and rarely in polar regions (where the sun and moon rise and set at a glancing angle or not at all).
==Name==

The terms ''wet moon'' and ''dry moon'' originate from Hawaiian mythology, where it was thought that the moon appeared as a bowl which would fill up with rain. The period where this is most common, January 20 - February 18, corresponds with Kaelo the Water Bearer in Hawaiian astrology and makes the moon known as the "dripping wet moon". As the year passes into summer, the crescent shape shifts, pouring out the water and causing the summer rains. After the "bowl" empties, it dries out and rights itself, creating the "dry moon". However, others say that this is a wet moon because it permitted the water to pour out.
The term "Cheshire moon" is a reference to the smile of the Cheshire Cat of Lewis Carroll's story ''Alice's Adventures in Wonderland''.

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「Wet moon」の詳細全文を読む



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