[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. >Danny _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
