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The Earth-Moon combined center-of-gravity - known as the barycenter, located 4,671 km (2902 miles) from the Earth's center - provides a precise gravitational reference point, enabling accurate time synchronization. As the lower mass of the moon causes lunar time to run ~56 microseconds faster than Earth’s per day. Using barycenter calculations, timekeeping between Earth and Moon can be precisely calculated, a necessity for lunar communications and navigation systems.