Abstract
From individual ILS data in a homogeneous system, we derived a new sequence of the coordinates of the pole. This was then used in an analysis of the secular polar motion. We found: 1) At a confidence level of 95%, the linear drift of the ILS mean pole over the last 80 years is along 63° 3 longitude West, at an average speed of 0″.00305/yr. 2) The libration of the mean pole is rather regular, with a prominent term of about 30 yr, and detectable terms of 18.6 yr and 9.3 yr. 3) Station Ukiah is drifting northwards at a speed of 0″.00276/yr, while all the other stations are quite stable. Hence the ILS data cannot be taken as showing an anti-clockwise rotation of the Pacific coast at present.
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