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What fraction of the moons surface is always lit?

April 26, 2017fraction lit moon

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What fraction of the moons surface is always lit?

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Because of its rotation, no one side of the moon is PERMANENTLY lit. Half of it is facing the Sun and the other half facing away. However, there may exist at either of the poles a (high) location from which the sun is always visible, except when eclipsed by the Earth or another planet or object.