Overview

delta T


Related Overviews

 

More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics

GO

Show Summary Details

Quick Reference

In astronomical time scales, the difference between Terrestrial Time (TT) and Universal Time (UT). Currently this difference is nearly one minute and is increasing at the rate of about 2 s every three years. It arises because the Earth's rate of axial rotation is not precisely uniform, but shows certain irregularities and is gradually slowing down. Universal Time is tied to the rotation of the Earth through its link with sidereal time, while Terrestrial Time is defined by the orbital dynamics of bodies in the Solar System.

Subjects: Astronomy and Astrophysics.


Reference entries

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