In a recent note, john gilmore said: > Date: Wed, 5 Apr 2006 22:00:49 +0000 > > Transmission latency is easily measured and corrected for where it is > important; and there are both theory and practice for doing so already in > place, elaborated for use in adjusting and rationalizing the TAI values > generated by the national observatories that form part of the BIPM network. > The most difficult case is where the round-trip path is asymmetric: terrestrial in one direction, satellite in the other. NIST dialup, at least, can detect this condition but not analyze it -- it refuses to correct.
> Relativistic mechanics is more interesting that classical, Newtonian > mechanics; but for the foreseeable future its use here is, unfortunately, > otiose. > The applicable statement of Special Relativity is that no signal can propagate faster than the speed of light. Generalizing this to Tony H's practical case with far greater latencies, the statement becomes, "As long as no signal used to coordinate remote processes propagates faster than the signal used to synchronize the clocks (even lacking any correction for propagation delay), no temporal inconsistency can appear among the various logs." -- gil -- StorageTek INFORMATION made POWERFUL ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
