Subject: | [Shop-talk] metric time - was OT- Excel help |
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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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