Bear scripsit:

> Or is it the not-quite-equal-to-SI and also not-quite-constant and
> also not-quite-predictable time unit exactly 86400 of which
> subdivide the time required for Earth to make exactly one complete
> rotation relative to the sun,

This one.  It is in physical terms a unit of angle rather than of time.
As such it is quite predictable and constant, being 15 seconds of arc
or roughly 7.27220521 × 10-5 radians.  It's just that its mapping to
SI seconds is not predictable or constant.

--
John Cowan          http://www.ccil.org/~cowan        cowan@ccil.org
What is the sound of Perl?  Is it not the sound of a [Ww]all that people
have stopped banging their head against?  --Larry

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