TDT

from WordNet (r) 3.0 (2006)
TDT
    n 1: (astronomy) a measure of time defined by Earth's orbital
         motion; terrestrial time is mean solar time corrected for
         the irregularities of the Earth's motions [syn:
         {terrestrial time}, {TT}, {terrestrial dynamical time},
         {TDT}, {ephemeris time}]
    
from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)
TDT
       Time and Date Table (DVB, UTC)
       
    

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