Although the plane of the Moon's orbit about the Earth is inclined about 5o, it's equator is inclined about 6.5o, resulting in a 1.5o inclination of the Moon's spin axis to its orbital plane around the Sun. This means that the Sun always appears low, close to the horizon at the poles of the Moon and areas within craters at the poles can be in permanent shadow.
RETURN TO PSRD 1996 article: Ice on the Bone Dry Moon.
RETURN TO PSRD 2003 article: The Moon's Dark, Icy Poles.
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