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A wet moon, which is called by some, a Cheshire moon, is the visual phenomenon when the horns of the crescent Moon both point up at an angle which is away from the horizon, so that the crescent takes on the appearance of a bowl or smile. It is in this bowl where the wet is supposed to be found.
A wet moon occurs when the crescent Moon is low in the sky and just above the horizon and at a point more or less directly above the Sun′s invisible position below the horizon. This is also nearly always during the winter months and during the time when the sun is or has set.
What Factors Determine the Wet Moon?
This phenomenon is determined by the positions of the Moon and Earth in their respective orbits, the inclinations of these orbits relative to one another.
Also playing a role in when a wet moon can be seen is the location of the observer in what latitude the sky is being seen from.
Wet moons occur routinely in the tropics, where the Sun and Moon rise and set nearly vertically, but are rarely found in the polar regions, where the Sun and Moon rise and set at a glancing angle or not at all.
(m5he-moon-wet-image) The Changing Moon, The Wet Moon
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