terrestrial dynamical time

Noun
  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 (synset 115181706)
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: time unit, unit of time - a unit for measuring time periods
    same as: ephemeris time, tdt, terrestrial time, tt

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