ephemeris time

1 definition found

ephemeris time - WordNet (r) 2.1 (2005) :

  ephemeris time
      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]