Not to put too fine a point on it, but my practical understanding is that any two or more clocks generally do *not* agree (that is - yield identical phase/frequency information) ever, anyway. So atomic horology - and beyond - means that we continue to ?adjust? ?compensate? clocks of whatever stability and accuracy to the current, agreed upon "ideal" - even as the ideal may move or evolve.
On Mon, Nov 3, 2014 at 4:27 PM, Tom Van Baak <t...@leapsecond.com> wrote: > > I don't see anything in the BIPM definition of the second regarding sea > level. > > Hi Mike, > > The usual wording for the definition of the SI second also includes the > word "unperturbed". That little word covers a host of physics and > engineering effects and can keep graduate students busy for years. You > either have to eliminate them from your clock or your lab, or extra > carefully measure then and back-out their effects on your clock's operating > frequency. > > For a really good example of the sort of corrections that are made inside > a cesium clock see: http://tf.nist.gov/general/pdf/1497.pdf > > By the time you read to page 30, you'll see table 3 and 4 which summarize > the perturbing corrections. > > /tvb > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.