(IERS).

The wobble's amplitude has varied since its discovery, reaching its largest size in 1910 and fluctuating noticeably from one decade to another. In 2009, Malkin & Miller's analysis of IERS Pole coordinates time series data from January 1946 to January 2009 showed three phase reversals of the wobble, in 1850, 1920, and 2005.

Measurements indicate the Chandler wobble has greatly diminished post-2015.

Hypotheses

Since the Earth is not a rigid body, the Chandler wobble should die down with a time constant of

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