terrestrial dynamical time (TDT)

terrestrial dynamical time (TDT)

Time scale used in orbital computations; TDT is tied to atomic clocks (International Atomic Time, TAI), whereas Universal Time is tied to observations. Prior to 1992, Ephemeris Time (ET) was used in publications of the ICQ/CBAT/MPC; since then, TT has been used. The difference between TDT and UTC in 1994 was 60 seconds (i. E. , UT + 60 seconds = TDT).

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Category: General astronomy
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terrestrial Dynamical Time (TDT or TT)

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