Re: frequency adjusting only

mayer@xxxxxxxxxxx (Danny Mayer) writes:

Unruh wrote:
"David L. Mills" <mills@xxxxxxxx> 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
.

Relevant Pages

  • Re: Newtons theory of "Universal Gravitation"
    ... The Moon orbits around the Earth. ... change, its distance stays about the same, and hence its orbit must be ... named that pulling force gravity. ...
    (sci.physics)
  • Re: Moon and Mercury similarities
    ... the first one is a picture of the Moon crater Schickard made ... resemblance to much of our Moon's crater Schickard. ... distances from the Sun" ... And Saturn, at its mean distance from the sun, is slightly higher ...
    (sci.astro.amateur)
  • Re: The Farce that is Called Henri Wilson
    ... >>>to determine the distance to the Moon to the cm, Henri? ... > There are four reflectors on the ...
    (sci.physics.relativity)
  • Re: But What Does Einstein Mean - Really?
    ... Moon ... | in time to an Earth here-now. ... | A nova is seen to have occurred at a distance of 70,000 light years from ...
    (sci.physics.relativity)
  • Re: Sunsite Danish News Server
    ... >> just got used to sunsite, and was over the moon with their response time ... >> when they pulled the plug on me. ...
    (uk.people.silversurfers)