What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?
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Moon's libration changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any instant). Moon's libration is caused by the eccentricity of its orbit around Earth and by a slight inclination of its axis of rotation.
reach: rather globalastronomyMoonSolar Systemtechnology
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