Physics
Scientific paper
Apr 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7...92o&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 7, Issue 1, p. 92-96.
Physics
3
Scientific paper
Deflexions of the vertical due to changes in luni-solar gravitational attraction can be determined by astronomical observations and the measures are of great importance in the derivation of values for parameters defining elastic properties of the earth. The primary purpose of the observations is the determination of time or latitude, or both, and the systematic deflexions of the vertical are small in comparison with the scatter of the observations so that regular observations made over a number of years are required for the detection of these effects. Eleven years of time and latitude observations made with the Herstmonceux Photographic Zenith Tube have been separately analysed and the two solutions reveal with great clarity the magnitudes and phases of the variations associated with tidal activity. The results are complicated because at Herstmonceux the deflexions arising directly from changes in the gravitational attraction of the moon have associated with them deflexions caused by changes in the attraction of the proximate waters of the English Channel which is itself affected by complex tidal activity.
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