[ntp:questions] Leap second functional question

Greg Hennessy greg.hennessy at localhost.localdomain
Thu Feb 21 02:44:38 UTC 2008


On 2008-02-20, Unruh <unruh-spam at physics.ubc.ca> wrote:
> No orbital dynamics obeys Newton's ( or Einstein's) law of gravitation only
> in TAI not in UTC ot UT1.

High precision orbital dynamics, such as the JPL's DE405, are done in 
Barycentric Dynamic Time, which runs at a different rate than TAI, but
is "TAI like" in that it has no leap seconds.

> Of course I cannot. Leap seconds are to take into account the random
> variations in the earth's rotation to one part in about 10^8. 

Leap seconds take into account the systematic slowing of the earth's
rotation. 




More information about the questions mailing list