Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..323c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 323-329.
Astronomy and Astrophysics
Astrophysics
11
Astrometry, Celestial Mechanics, Earth Rotation, Planet Ephemerides, Differential Equations, Gravimetry, Nutation, Parameter Identification
Scientific paper
Conceptual definitions of the earth rotational parameters (ERP) used for obtaining astronomical references with an accuracy of 0.001 arcsec are reviewed, along with the fit between conceptual and conventional values. Conceptually, the instantaneous rotation of the earth is selected for calculating the ERP from a terrestrial frame of reference. It is shown that in calculating the third parameter, the UT1 value becomes unclear when it is related to the mean sidereal time using conventional models, and can be improved by using the stellar angle to obtain the angular speed of the earth in space directly. The accuracy of the value for the Celestial Ephemeris Pole (CEP) is demonstrated to be higher if considered conventionally in terms of the model of the precessional nutation of the earth. This formation accounts for the terrestrial motion of the instantaneous pole of rotation and the corresponding celestial motion.
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