tdt

Found in Anh - Anh (Wordnet)

Definition Noun : 1. Terrestrial Dynamical Time : A precise astronomical time scale. It is a theoretical uniform time based on the orbital motion of the Earth around the Sun, used for calculating the positions of celestial bodies. It is essentially the modern successor to Ephemeris Time (ET). Usage TDT is a specialized scientific term used almost exclusively in the fields of astronomy, astrophy...