[Shop-talk] metric time - was OT- Excel help

[Randall]

> anyone ever used or heard of the Julian date?
> 16 digits covers most anything you might need as accurately as you
> might want.

Then there is GPS time, usually stored as the number of weeks since Jan 4
1980, plus a double precision count of seconds (and fractions of a second)
within the week.

But when you start worrying about fractions of a nanosecond (our overall
accuracy budget is about 100 picoseconds), accuracy becomes a very slippery
concept.  Is that in the GPS satellite time frame, or the user time frame,
or the observed satellite time frame?

-- Randall