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A uniform time measure now kept by atomic clocks. Ephemeris Time (ET) was used in the Astronomical Almanac from
1960-1983, but was replaced by barycentric dynamical time when the IAU 1976 System of Astronomical Constants was
implemented in the Astronomical Almanac in 1984.
 Barycentric Dynamical Time, Coordinated Universal Time, Ephemeris Time, International Atomic Time, Time, Universal Time
Duffett-Smith, P. "Ephemeris Time (ET) and Terrestrial Dynamical Time."
§16 in Practical Astronomy with Your Calculator, 3rd ed.
Cambridge, England: Cambridge University Press, pp. 22-23, 1992.
Montenbruck, O. and Pfleger, T. "Universal Time and Ephemeris Time." §3.4 in Astronomy on the Personal Computer, 4th ed.
Berlin: Springer-Verlag, pp. 41-44, 2000.
© 1996-2007 Eric W. Weisstein
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