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View submission: Is the Earth rotating faster?
For mountain glaciers it might be difficult, but we're actually *extremely* good at tracking the movement of mass across the Earth. Missions like GRACE[1] that measure the Earth's gravity at very high levels of precision are used to track the evolution of mass distributions. In practice these changes tend to be related to ocean patterns and ice melts.
1: https://gracefo.jpl.nasa.gov/
There's nothing here!