Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.0204d&link_type=abstract
American Astronomical Society, DDA meeting #31, #02.04
Astronomy and Astrophysics
Astronomy
Scientific paper
The histories of the Universal Time (UT) and International Atomic Time (TAI) timescales and the basis for the mathematical models are examined. It appears that a simple special relativistic time dilation correction has been overlooked in the TAI timescale model. This relativistic correction compensates both the apparent deceleration of the lunar mean motion and the 0.8 seconds/year divergence observed between the UT and TAI timescales. The calculated correction of -27.01"/cy2 for the apparent lunar deceleration using special relativity is in close agreement with the observed Lunar Laser Ranging value of -25.9+/-0.5 "/cy2. The calculated timescale divergence is -2.24E-3 seconds per day, which is close to the observed value of -2.16E-3 seconds per day. Evidence is also presented that the timescale divergence can not be due to tidal friction as usually assumed. This raises the issue whether the ultraprecise timescales may need to be evaluated for consistency with Universal Time, the original scientific time standard.
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