Dog Ed wrote:
you wrote: "The Sagnac Effect cannot be explained by Relativity and it
cannot distinguish whether the Earth is rotating or the universe. When
contrasted with the zero velocity Michelson-Morley experiment, it
becomes a potent evidence in favour of Geocentricity".
Reply: The Sagnac effect is non-relativistic; I believe it is easily
understood by considering the geometry of rotating bodies. In other
words, the code-phrase "cannot be explained by Relativity" should more
properly read "can be explained without bothering with
Relativity"--you could just as well say "The sum of angles in a
right
triangle cannot be explained by Relativity." Proper response: So what?
As to the second point, it's well documented in multitudes of
experiments that there is no aether drift. Therefore, either there is
no
aether, or it is co-moving with the Earth. As already noted by others
the facts that there is no detectable aether drift and that the Sagnac
effect exists does not add up to geocentrism--both are perfectly well
explained by the standard model of physics.
Again we see a geocentrist living in the past--the Sagnac effect was
first noted in the late 1800s and rigorously defined and theoretically
explained by Sagnac around 1913. I don't think any serious physicists
since that time have seen it as evidence of geocentrism. The
Michelson-Morely results were also late 1800s, and although experiments
in 1925 gave positive results for aether drift they were disproven and
Michelson-Morely reconfirmed within a couple of years. Ongoing
experiments have also confirmed M-M to rather astounding acccuracies.
There's a rather wonderful explanation of the Sagnac effect written by
Professor Geoff Stedman of the University of Canterbury (New Zealand)
at
http://www.phys.canterbury.ac.nz/res...ring_open.html.
They're using a large ring-laser at Christchurch NZ to measure
infitesimal variations in the Earth's rotation due to earthquakes and
such...cool science. (Also completely anti-geocentric, since a rotating
Earth is central to their work!)
--Don Stahl
PS: Dunash/Mifletz, this is again a repost of the standard Geocentric
line--I made exactly the same points about Sagnac and Michelson-Morley
in response to Spoq. He had no logical reply either. It's very clear to
me that geocentrists have no actual interest in the science and are
merely coughing up the same points over and over. I'm not sure why you
do it...I guess I will write out a set of standard replies to claims
that Sagnac M-M, the expanding Universe, NASA coordinate systems, etc
support geocentrism and just whack one of them in each time you post
another rehash of your same old nonsense. Yeah...that's quick and easy,
and if each essay is well-written and documented with sources it ought
to demonstrate to those that haven't had the dubious pleasure of
reading
all your earlier posts of the same material that geocentrism is,
indeed,
the province of cranks and religious fundamentalists--and not of
science. (That's not fair: it's the province of Christian
fundamentalists only!)
Selbrede's (a top Californian geocentrist) reply:
"As to the second point, it's well documented in multitudes of experiments
that there is no aether drift." These experiments all assume the motion of
the earth through the aether -- thus constituting the grounds of rejection
due to petitio principii. "Aether drift" is here synonymous with detection
of the Earth's alleged annual motion around the Sun -- this cannot be found,
and since this is presumed to exist (the antigeocentric bias in data
interpretation), alternate explanations are sought for the effect to explain
it away under color of forthrightly explaining it.
"Therefore, either there is no aether, or it is co-moving with the Earth."
This is a false dichotomy, since it grossly glosses over the third
legitimate alternative, which treats the aether as rotating diurnally about
the earth's axis. This hypothesis explains the non-detection of the earth's
alleged motion around the Sun (since that relative motion of aether and
Earth doesn't exit to be detected) and the Sagnac effect (which arises due
to the rotation of the aether around the Earth). In other words, given the
two facts of a Michelson-Morley null result and the Sagnac effect, one
legitimate interpretation (in addition to the others cited by the critic) is
that the aether exists, but the earth doesn't exhibit translational motion
through it (corresponding to annual motion around the Sun) but the rotation
of the aether about the Earth's axis (which, ex hypothesi, would more
accurately be termed the aether's axis of rotation) gives rise to the Sagnac
effect.
"As already noted by others the facts that there is no detectable aether
drift and that the Sagnac effect exists does not add up to geocentrism--both
are perfectly well explained by the standard model of physics." More
accurately, the standard model assumes that aether drift should have been
detected (because geocentricity was assumed to be untrue) and explains this
unexpected null result without admitting to its fudging and occlusion of
initial assumptions.
Where the non-geocentric aether theorists go astray is in failing to
confront the consequences of non-detection: they have to invoke aether
entrainment models so that the null result is treated as a local phenomenon,
rather than a global one (as relativity predicts). The problem is that there
must be some transitional gradient from the locally-entrained aether to
non-entrained aether more distant from the entraining mass, and that would
be detectable. No aether-entrainment proponent has been willing to deal
with this required gradient (and it is surely a continuous gradient, not a
discrete boundary). Further, entrainment ratios for the translational and
rotational cases, even under superposition, should be detectable, but are
not found to exist.
Drift isn't a good term, although it's embedded into the nomenclature, since
the heliocentric model doesn't depict the Earth as drifting. The fact is,
before Michelson-Morley performed their interferometry experiment,
scientists expected one day to soon detect both the "aether wind" of the
Earth's journey around the Sun, and the "aether scour" resulting from the
planet's alleged rotation within the aether. Geocentrists offer up a very
straightforward explanation for these effects: the ether wind wasn't found
because the Earth doesn't possess the assumed motion, and the aether scour
was found in 1913 when Sagnac performed his work. One can disagree with this
explanation, preferring alternate ones to replace it, but one cannot rule
out the prima facie acceptability of the explanation and its conformity with
the data. When will you guys pay attention to the late Sir Fred Hoyle's
extended discussions of precisely this issue in his many highly-regarded
astronomy textbooks? (P.S. While I was studying general relativity theory at
CalTech one summer, Saul Teukolsky pointed out Hoyle walking across campus.
The CalTech GR-Black Hole-astrophysics scientists were extremely respectful
of Hoyle. Why does Hoyle's inclusive perspective receive such disdain here?
Are this site's standards higher than CalTech's? Or is rhetoric king?)


