Overview

ephemeris time


Related Overviews

 

'ephemeris time' can also refer to...

 

More Like This

Show all results sharing these subjects:

  • Astronomy and Astrophysics
  • Physics

GO

Show Summary Details

Quick Reference

The time-scale that was used in calculating orbits within the Solar System from 1960 to 1984. Its fundamental unit was the ephemeris second which was defined by the statement that the tropical year at the epoch 1900.0 was precisely 31 556 925.9747 ephemeris seconds. Ephemeris Time was in many ways inconvenient, and in 1984 it was replaced by Terrestrial Dynamical Time (now known as Terrestrial Time) which has the SI second as its fundamental unit.

Subjects: Astronomy and Astrophysics — Physics.


Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.