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

Subject: [Shop-talk] metric time - was OT- Excel help
From: TR3driver at ca.rr.com (Randall)
Date: Fri, 16 Mar 2012 00:20:24 -0700
References: <4F61A9BA.5030407@talktalk.net><OF5E99C812.D08CAD37-ON852579C2.0042EA8C-852579C2.00437113@mail.megageek.com><001e01cd02e9$82d057e0$887107a0$@rr.com><4F626FBF.9040506@earthlink.net><CAO8Q7CMUWsS+hk55fJe-dtb=gimy4j63TCsMdyB_+mVTXdgtsA@mail.gmail.com> <hl45m71f5d9dnftmqj0bia83poerd2r0di@4ax.com>
> 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  

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