Encyclopedia > Terrestrial Time

Article Content

Terrestrial Time

Terrestrial Time (TT) is the modern time scale that is used instead of ephemeris time, which is obsolete. TT was introduced by the International Astronomical Union (IAU) in 1991 as the coordinate time scale consistent with the theory of general relativity for an observer on the surface of the Earth. For all practical purposes, it is equal to:

TT = TAI +32.184 s

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Reformed churches

... (USA) has split a number of times in its history. Many of these historic splits have been resolved. From the continuing branch churches, some have split in turn. Only ...