Steady Change in Flattening of the Earth: The Precession Constant and its Long-Term Variation

Details Steady Change in Flattening of the Earth: The Precession Constant and its Long-Term Variation Steady Change in Flattening of the Earth: The Precession Constant and its Long-Term Variation

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aj....135.1021b&link_type=abstract

The Astronomical Journal, Volume 135, Issue 3, pp. 1021-1023 (2008).

Astronomy and Astrophysics

Astronomy

Earth, Gravitation, Time

Scientific paper

Variation in the second-degree zonal harmonic J 2 of the Earth's gravitational potential is discussed and its impact on the coefficient H associated with the precession constant determined. The long-term variation dH/dt amounts to -8.45 × 10-11(year)-1 and it should be incorporated into the list of the fundamental astro-geodetic parameters, as a derived parameter, corresponding to dJ 2/dt. Because it varies in time, the precession constant should be called the "precession parameter."

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