Time Scales in the JPL and CfA Ephemerides

Details Time Scales in the JPL and CfA Ephemerides Time Scales in the JPL and CfA Ephemerides

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.1005s&link_type=abstract

American Astronomical Society, DDA meeting #30, #10.05; Bulletin of the American Astronomical Society, Vol. 30, p.1146

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Over the past decades, the IAU has repeatedly attempted to correct its definition of the basic fundamental argument used in the ephemerides. Finally, they have defined a time system which is physically possible, according to the accepted standard theory of gravitation: TCB (``Bary- centric Coordinate Time''). Ironically, this time scale is mathematically and physically equivalent to Teph, the time scale that has been used by JPL and by MIT/CfA in their ephemeris creation processes since the early 1970's. TCB differs from Teph by only a constant offset and a constant rate. As such, TCB provides an equivalent alternative to Teph, but it does not allow increased accuracy as others have claimed.

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