> >When you get to the sub-100 ns level UTC is not GPS. And >UTC(NIST) isn't UTC(USNO). Even the national labs don't >agree down to the last ns. > >/tvb
Remember that no one lab has the true UTC clock. UTC is an offset to Atomic Time (TAI), and TAI is the weighted average of hundreds of clocks in dozens of National Labs all over the world. The Bureau International des Poids et Mesures (BIPM formerly BIH) collects data and publishes TAI, the International Earth Rotation Service (IERS), determine when Leap Seconds increment/decrement the offset based on variations of the earths rotational period. See: http://www.bipm.fr/en/scientific/tai/tai.html for details! -Mike- _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts