Re: Was Einstein an 'Irrational Plagiarist'?


<rotchm@xxxxxxxxx> wrote in message news:1168793738.952155.56580@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

[Label]

Since Earth mass and orbiting velocities are relativity small,
the "exact" GR-effect can be approximated by two effects,
one depending on the velocity only and another depending
on Earth mass and height above the surface only.

In GR theory, the "full" GR effect (aprox.) composes of the mass
effect and the speed effect.
This later effect is *called* the SR effect although it is still a GR
effect. That is what you are saying?


The former effect (-7 ns) would be seen if there were no
mass present and the satellite and observers would propell
themselves around the centre of a massless Earth - which
is not the case - but that is the reason why it is called the
SR-effect.

Correct, and *called* SR-effect.

The latter effect (+45 ns) would be valid if the satellite
would not move w.r.t. the observers on the surface, i.o.w.
of the satellite would "hang" in a fixed location - which is
not the case - but since the "effect" is independent of velocity,
it is sometimes called the "pure GR effect".

Ah!.. again *called* the pure GR effect.

Its about the words again... That cleared me up.

So the reasoning is: Since GPS is in a gravity field, we can not
(should not) use SR. We should use GR. In our case, there are two GR
effects: One about the speed -called- SR effect and one about
grav.pot. called GR effect (or pure GR as you said).

Actually a safer way to express it is that there is only one effect,
and it can only be calculated with GR.
But, goto [Label]

Do have a look at that ProjectA.pdf.
It is very instructive - and easy.

Dirk Vdm

.

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