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invaderxan: FOTD: The Moon’s orbit isn’t circular so it rocks back and forth as it orbits. Over a month, about 59% of its surface is visible from Earth. The effect is known as libration.
invaderxan: FOTD: The Moon’s orbit isn’t circular so it rocks back and forth as it orbits. Over a month, about 59% of its surface is visible from Earth. The effect is known as libration.