Thursday, March 25, 2004

Dynamical Time

The time scale of dynamical astronomy (celestial mechanics). The orbital motions of celestial bodies subject only to Newton's laws of motion and law of gravitation, as modified by relativity, proceed as a function of dynamical time. In 1952 the International Astronomical Union (IAU) defined a dynamical time scale named Ephemeris Time (ET), which is based on the Earth's orbital


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