Re: Hansen discovers how to reason.

From: Sbharris[atsign]ix.netcom.com (sbharris_at_ix.netcom.com)
Date: 01/25/05 

Date: 24 Jan 2005 19:23:47 -0800

Harris:
> Constant speed with regard to the medium
> would not produce constant round trip travel times in all directions
> which added up to c, unless the medium was always at rest with regard
> to all sources.

Androcles >>That's right, it wouldn't, so why does Einstein pretend it
does, Mr. "Scientist"?<<

COMMENT:

Because Maxwell's equations don't work in all inertial frames, unless
it does. Moreover, experiments have confirmed Einstein's hypothesis.

Harris
> Experimentally, round trip times which add to c in every direction
is what we observe, so therefore the medium must be at rest with regard
to all sources.<

Androcles: Bull***. Name the experiment.

COMMENT:

Okay, experiment and reference detailed below.

These experiments have been done in vacuo over distances of
approximately 4 earth radii, by the global positioning satellite
system. These satellites are moving plenty fast enough v (4 km/sec or
so) to tell if the signals from them are moving from them to us at c+v
or c-v or whatever through vacuum, no matter what direction they are
moving. If motion affected the speed of the radio signal through
vacuum, a satellite moving away from us at 10^-5 c should have a very
different one-way signal trip time (measured by the pre-synchronized
satellite clocks) than one moving toward us that fast. These satellites
position points on the ground to within 20 m laterally and 1 m
vertically, from distances greater than 25,000,000 m. That's one part
in 10^7. Since the satellites opperate by assuming that their signals
travel to Earth at c, I leave it to you to figure out how much a 10^-5
velocity error in their signal marker travel time would screw up their
measurement. According to you, the whole system shouldn't work at all.

But it does work, of course. It can used to test not only Einstein's
theories of general and special relativity in time dilation, but also
to directly test whether or not there is variance in the speed of light
on one-way and two-way trips to satellites in vacuum at 4.18 earth
radii. To factor out the precise distance to the satellite which is not
known as precisely, the one-way speeds can be divided directly by the
two-way speeds (which essentially divides the one-way time by the
two-way signal marker time). Of course in relativity, all these
velocities of timed signal markers in vacuum, whether one-way or round
trip, are the same: c. Which means the two-way time is always twice the
one-way time. Which is what we find by experiment, to less than 1 part
in 10^8. The doesn't work if satellite v addition or subtraction from c
affects one half the loop but not the other, ie the downlink travel
time (which it would according to your ideas) but not the uplink travel
time.

Now that experiment has rejected your ideas, I expect that, being the
nutjob that you are, you'll start in with conspiracy theories.

http://prola.aps.org/abstract/PRA/v56/i6/p4405_1

Phys. Rev. A 56, 4405-4409 (1997)
[Issue 6 - December 1997 ]

Satellite test of special relativity using the global positioning
system

Peter Wolf1,2 and Gérard Petit1
1Bureau International des Poids et Mesures, Pavillon de Breteuil,
F-92312 Sèvres
Cedex, France 2School of Mathematical Sciences, Queen Mary and
Westfield
College, Mile End Road, London E1 4NS, Great Britain
Received 20 November 1996; revised 19 May 1997

A test of special relativity has been carried out using data of clock
comparisons between hydrogen maser clocks on the ground and cesium and
rubidium
clocks on board 25 global positioning system (GPS) satellites. The
clocks were
compared via carrier phase measurements of the GPS signal using
geodetic receivers at a number of stations of the International GPS
Service for Geodynamics (IGS) spread worldwide. In special relativity,
synchronization of distant clocks by slow clock transport and by
Einstein synchrony (using the transmission of light signals) is
equivalent in any inertial frame. A violation of this equivalence can
be modeled using the parameter delta c/c, where c is the round-trip
speed of light (c=299 792 458 m/s in vacuum) and delta c is the
deviation from c of the observed velocity of a light signal traveling
one way along a particular spatial direction with the measuring clocks
synchronized using slow clock transport. In special relativity delta c
/c=0. Experiments can set a limit on the value of delta c /c along a
particular spatial direction (henceforth referred to as "direction of
delta c"). Within this model our experiment is sensitive to a possible
violation of special relativity in any direction of delta c, and on a
nonlaboratory scale (baselines >= 20 000 km). The results presented
here set an upper limit on the value of delta c /c < 5x10-9 when
considering all spatial directions of delta c and delta c/c < 2x10-9
for the component in the equatorial plane.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRA/v56/p4405
DOI: 10.1103/PhysRevA.56.4405
PACS: 03.30.+p, 06.20.Jr, 06.30.Ft, 95.40.+s

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