[LEAPSECS] Consensus building 2

michael.deckers michael.deckers at yahoo.com
Fri Feb 4 02:52:57 EST 2011

On 2011-02-04 00:32, Stephen Colebourne proposed the following

> - definition: TAI-2008-second - the same as SI-second for the purposes

> of this discussion

The TAI time scale uses the SI second alright, but it is the
value of the SI second as realized on the rotating geoid. You
get a different time scale if you use the SI second at other
points in spacetime, such as the geocenter. And if you extend
TAI from the geoid to other places close to the surface of the
Earth, using a coordinate system corotating with the Earth, you
will find that the "TAI second" differs from the SI second as
realized at these places.

I fully agree with you that this is irrelevant for leap
seconds -- but for the definition of TAI it is relevant.

Michael Deckers.

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