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Relativistic time scales in the solar system

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Abstract

This paper deals with a self-consistent relativistic theory of time scales in the Solar system based on the construction of the hierarchy of dynamically non-rotating harmonic reference systems for a four-dimensional space-time of general relativity. In our approach barycentric (TB) and terrestrial (TT) times are regarded as the coordinate times of barycentric (BRS) and geocentric (GRS) reference systems, respectively, with an appropriate choice of the units of measurement. This enables us to avoid some of the inconsistencies and ambiguities of the definitions of these scales as these are currently applied. International atomic time (TAI) is shown to be the physical realization of TT on the surface of the Earth. This realization is achieved by a specific procedure to average the readings of atomic clocks distributed over the terrestrial surface, all of them synchronized with respect to TT. Extending TAI beyond the Earth's surface may be performed along a three-dimensional hypersurface TT = const. The unit of measurement of TAI coincides with TB and TT units and is equal to the SI second on the surface of the geoid in rotation. Due to the specific choice of the units of measurement the TB scale differs from the TT (TAI) scale only by relativistic nonlinear and periodic terms resulting from the planetary and lunar theories of motion. The proper time τ0 of any terrestrial observer coincides with the coordinate time τ of the corresponding topocentric reference system (TRS) evaluated at its origin. τ0 is reacted to TT (TAI) by the relativistic transformation involving the GRS velocity of the observer, its height above the geoid and the quadrupole tidal gravitational potential of the external masses. The impact of introducing TB and TT on the units of measurement of length and the basic astronomical constants is discussed.

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Authors and Affiliations

  1. Institute of Applied Astronomy, 197042, Leningrad, U.S.S.R.

    V. A. Brumberg

  2. Sternberg State Astronomical Institute, 119899, Moscow, U.S.S.R.

    S. M. Kopejkin

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  1. V. A. Brumberg
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  2. S. M. Kopejkin
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Brumberg, V.A., Kopejkin, S.M. Relativistic time scales in the solar system. Celestial Mech Dyn Astr 48, 23–44 (1990). https://doi.org/10.1007/BF00050674

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