Re: General Relativity ?

[Mark Sylvester <msylvest@SPIN.IT>]

Is the Sagnac effect the same thing as the gravitational red/blueshift? I
haven't come across this name and it isn't in the index of any of the
several relativity books on the shelf next to me.

Mark.

At 08:55 25/11/98 -0600, Gary Karshner wrote:
> Ken,
>        This is not just a theoretical exercise, the Sagnac effect affects
> our time standard due to the rotation of the standard clocks on the earth,
> and GPS navigational satellites are "corrected" for the effects of general
> relativity. The satellites clock run 442.5 parts in ten to the twelfth
> faster then a similar clock on the ground. There is a nice article on this
> in the May-June 1996 issue of Mercury entitled "Relativity in the Palm of
> your Hand."
>
> Gary
>
>
> > A signal is sent from an orbiting station to the ground. The receiver will
> > measure the in coming frequency to be greater than the sender would
> > measure it. The
> > question I was asked is whether this is due to the earthbound clock
> > running at a slower rate or the signal actually increasing in frequency or
> > can you really tell? I think I am in the latter camp.
> Gary Karshner
>
> St. Mary's University
> San Antonio, Texas
> KARSHNER@STMARYTX.EDU
Mark Sylvester
United World College of the Adriatic
34013 Duino TS
Italy.
msylvest@spin.it
tel: +39 040 3739 255