Tidal irregularities in the earth's rotation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Earth Rotation, Earth Tides, Spectrum Analysis, Terradynamics, Astrometry, Earth Planetary Structure, Geopotential, Nutation, Phase Shift, Rotary Stability, Secular Variations, Universal Time

Scientific paper

Several studies on the tidal nonuniformity of the earth's rotation are reviewed. The discussion covers the spectral analysis of astronomical observations made over a period of 20 years at 25 observatories. The values of the Love number and several phase shifts are determined. It is shown that in order to improve the accuracy of these values and to discriminate between tidal and nutation waves with similar frequencies, long periods of observation are required. Clock corrections should be calculated with an accuracy of 0.0001 to 0.00001 sec.

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