Re: Light Speed Test versus Special Relativity

From: George Dishman (george_at_briar.demon.co.uk)
Date: 03/25/05 

Date: Fri, 25 Mar 2005 00:07:50 -0000

"Jim Greenfield" <jgreen@seol.net.au> wrote in message
news:e7b5cc5d.0503232023.1e8326bf@posting.google.com...
>
> Stan,
> While I am a strong supporter of the 'ballistic theory' (feel free to
> borrow
> c'=c+v ), I think you have stuffed up. As George D points out, I think
> you are mistaking the changed travel (distance) as altered speed for
> the light.

Thank you Jim, you are quite correct.

> I don't know what the time difference in the 'signal' time interval
> would be for Io due to c-v as it is regressing from earth, and c+v as
> it approaches, but I think it would only be of the order 1 second, not
> 1,000.

Not a bad guess :-) The orbital speed of Io is 17.34 km/s
so the time difference between approaching and receding is
about 0.3s. However, that is when the motion of Io is
directly towards or away from the Earth.

> For Cassini, with a light travel time of about 5000 sec, and its velocity
> 6,000 km/hr (horizontal orbit ref us), the difference in signal travel
> will only be .1 sec between its approach and regression from us.
> So what is needed to be observed and measured, is only that 'event'
> (signal)
> exactly as Io winks out (eclipsed) and then on. As this is likely to
> be in the same ballpark as Cassini, I'm afraid we won't see it (time
> it) accurately enough to account for the various motions which have
> taken place meanwhile.

The radius of Jupiter is about 71,500 km while the radius of
Io's orbit is 421,600km. That means that its motion is almost
transverse at the time of a transit, the component of the
speed directed towards Earth is reduced to only 2.98 km/s so
the time difference is only 0.05s

> PS: Good luck with the polite approach; ask difficult (for SR)
> questions, and expect abuse, ridicule, (anything but concise,
> logical answers)

You know me better than that Jim, don't you?

best regards
George

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