This precisely why I stopped wearing a watch years ago.... Stranger: "What time is it?" Me: "When?" Stranger: "What 'when'? - now of course!" Me: "Now - where? - Now you? or Now me? (Hint ~ 3 nsec dt)" and so forth and so on. better a watch don't have - no questions
On Tue, Sep 3, 2013 at 4:47 PM, Tom Van Baak <[email protected]> wrote: > > Nowhere does the opinion mention if the timestamps were taken on > > the same clock or if the two clocks were synchronized. > > PHK, > > Correct. This is an age-old problem, whether its minutes or nanoseconds. > Time-stamps are inherently relative to a local oscillator's time and rate > offset, and affected by frequency drift and stability levels. > > A solution to this problem is for the "first responder" to take the cell > phone(s) and simultaneously send a text message to himself from each phone. > That could help establish a legal time difference (unless, there are > variable reception or carrier-specific delays). > > They could also simultaneously send cell phone photos of a handheld GPS > receiver's time display. That could help establish a legal time accuracy > question (unless, the cell phone or GPS receiver were in some sort of > hold-over mode). > > For extra credit, further photos can be sent each hour for hours or days > to determine the cell phone frequency drift and stability parameters. > > Then again, realize that a jury of your fellow citizens, not a jury of > your "peers", will decide the question of timing. Thus to raise technical > issues like syntonization vs. synchronization, or standard vs. Allan > deviation, or GPS vs. UTC clocks will probably not help your case. > > /tvb > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
