Re: Superluminal Signals in the Zombie World

On Fri, 17 Mar 2006 18:36:16 -0800, penguinista wrote:

SCW wrote:
Actually, I am of the opinion that we can only measure c_0 from the last
reflection. This would go a long way to explaining why all measurements
give the same results.

SCW

A good test of source speed invariance of light speed is to watch
Jupiter's moons. If light speed was relative to the source, light from
the approaching side of a moons orbit would reach us early, and light from
the receding side of the orbit late.

http://www.spoonfedrelativity.com/ had a good illustration of this, but
the site appears down.

It wouldn't make all that much difference. Call the Earth-Jupiter
distance 8.00 * 10^11 m. (The actual distance will vary since Earth and
Jupiter are in their respective orbits; this is a back-of-envelope
calculation).

Io orbits around Jupiter with a period of 1.77 days. This makes for an
orbital speed of about 17,300 m/s, and a computed Newtonian time
difference of about 0.154 seconds out of 2668.51 seconds total.
(d/(c+v)-d/c, basically.)

Since the Earth can be moving closer or farther away at a rate of 10^-4 c,
or, put another way, a maximum of 0.36 seconds gained or lost every hour,
this doesn't appear to be all that easy to measure, though it doesn't
appear totally impossible, especially if Jupiter is in opposition,
generally nullifying the Earth motion.

One might gain better results from, say, Neptune. Triton orbits Neptune
with a period of 5.877 days, or an orbital velocity of 4390 m/s. Since
Neptune has a perihelion of 4.459 * 10^12 m the closest it can ever get to
us is 4.306 * 10^12 m, yielding a nominal transit time of 14364.6
seconds and a Newtonian delta of .21 seconds.

Unfortunately it appears the site is down for me as well.

http://en.wikipedia.org/wiki/Jupiter
http://en.wikipedia.org/wiki/Neptune

--
#191, ewill3@xxxxxxxxxxxxx
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