Tom Van Baak wrote:
Whether the answer is (a) or (b) doesn't change the fact that the earth day is a poor clock compared with other clocks now available. Besides tidal friction effects which might be hard to imagine, or lunar effects which you already know about, note that every time it rains or glaciers form and melt it changes the angular momentum of the poor spinning planet. Then again, many OCXO are also affected by humidity...
The Chilean earthquake changed the angular rotation rate (or, probably more accurately, changed the direction of the axis of rotation as well) of the earth a small amount, as do most large earthquakes.
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