Unruh wrote: > [EMAIL PROTECTED] (Danny Mayer) writes: > >> Unruh wrote: >>> "David L. Mills" <[EMAIL PROTECTED]> writes: >>> >>>> Brian, >>>> The longest delay NTP response was from the Moon, as simulated at JPL. >>>> Next step is the Mars orbiters and then the rovers. JPL discovered the >>>> max distance threshold had to be increased to handle the Moon delay. >>> Thats only a few sec. >>> And it is symmetrical. Could probably still get usec resolution. > >> Of course it's not symmetrical. You of all people should know better >> than that. > > The speed of light differs in different directions? > And if the response is fast, the distance has not changed much either > (In a msec the moon moves about a meter, which is 3nsec, way below any > computer resultion)and that is amost all perp to the earth.Ie, the > difference in distance during the response time of the remote computer is > negligible. If you aim for the moon when the moon is just setting and you > are on the equator, the difference in path lengths is about 5usec, again, a > completely negligible amount. > > Now of course the synchronization will not proper time on the moon, but the > sync of the earth clock.
And neither the moon or other is moving along their geodesic? Danny _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
