[LEAPSECS] the big artillery

Tony Finch dot at dotat.at
Thu Nov 6 07:38:05 EST 2014

Zefram <zefram at fysh.org> wrote:
> Warner has said things like "the UT1 second is 1e-9 different from the
> SI second".  That statement implies that the UT1 second is a physical
> quantity, with dimensionality of proper time, which can thus be measured
> using the SI second as a unit.

The UT1 second is 2pi/86400 times the reciprocal of the angular velocity
of the Earth. The units for this quantity are just seconds (because angles
are dimensionless), or if you want to be more explicit, seconds per
2pi/86400 radians.

f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Tyne, Dogger: South 4 or 5 backing southeast 6 to gale 8. Moderate becoming
rough. Occasional rain. Moderate or good.

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