tom wrote:
On 3/12/2011 2:40 AM, Szczepan Bialek wrote:
Uzytkownik napisal w wiadomosci
et...
On 3/11/2011 3:29 AM, Szczepan Bialek wrote:

The "full Moon" was on 2008/01/22. The distance was about 365 000 km.

Quite incorrect, since perigee was 366435 km on the 19th. Your
number is
way too low for what it would have been on the 22nd.

Do you ever check anything for correctness?

I am asking if radio waves are faster than light.

Radio waves and light are the same thing except we call them something
different due to wavelength.

Now is possibility to measure the both between the Earth and Moon and
speed
of radio waves between Mars and Earth..
For centuries is possibility to measure speed of light in space between
Jovian and Earth.

Probably the Moon is to close to the Earth to pick up the difference.
Is it
enough at full correctness?
S*



Tests of earth to moon to earth, earth to venus to earth all give the
same speed of light regardless of frequency used.


Not precisely true. Interplanetary space slightly dispersive. Emphasis
on *slightly*.

Kenelm Philip predicted a difference back in 1957

Modern estimates for electron density in interplanetary space of 1E6 to
1E10 per cubic meter.

dTau = e^2*Ne*L/(2*pi*m*c) * (1/f1^2 - 1/f2^2)

e= charge on an electron 1E-18 Coulomb
m = mass of an electron at rest (9.11E-31 kg)
c = velocity of light (3E8 m/s)
L = propagation distance
Ne = electron density (pick a number between 1E6 and 1E10)

f1 and f2 are the frequencies (in Hz) (assumed relatively closely spaced)

To bound the magnitudes.. for 1000 light year and 1 and 2 GHz, the
dispersion is about 1 nanosecond.


-- if you're interested in optical as opposed to RF
http://ipnpr.jpl.nasa.gov/progress_report/42-65/65I.PDF