Abstract
Observations of astronomical latitude made at Washington are analyzed for a secular trend. Comparison with the variation of latitude based on the path of the rotational pole of the International Polar Motion Service shows linear trends in good agreement. No evidence is found for a 24 yr libration of the pole. Systematic differences between observed and derived latitudes indicate that there are nonpolar variations in Washington latitude. Evidence is presented for the correlation of seismic activity with abrupt changes in the nonpolar variation, and the consequences of a changing geopotential surface are discussed with regard to observations of the rotational pole of the Earth.
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