[Physics] Physics Digest, Vol 7, Issue 1

[Doug Marett]

Interesting idea... sounds like a lot of work though.

On Thu, Jul 20, 2017 at 12:14 PM, <cj at mb-soft.com> wrote:

> Your one-way speed of light.
>
> I may have done some useful experimemnts for you in 1992.  At that time, I
> was intrigued by the fact that very rarely during history, it had been
> noticed by astronomers that one of the four Galilean Moons of Jupiter
> "suddenly disappeared" for a few seconds.  It was thought that that only
> happened when the Earth was in a rare orbital plane of the Galilean Moons,
> where the Sun's light to get to one of the moons got blocked by one of the
> other moons.  People (then) had realized that can only happen for a few
> seconds, but, astoundingly, no one had ever done the math to predict the
> event.  So I decided to spend about six months in calculating the VSOP87
> millions of terms to calculate the exact orbits.  After about si months of
> calculating, I arrived at a prediction of about four such events, several
> years later (which no one had ever predicted prior to that).  The events
> were only visible in desolate locations, and I did not see any of them.
> Later, some other people did similalr calculations.
>
> The point here is that the light had to travel around 500 million miles to
> get to us after the actual occultation occurred near Jupiter.  Observation
> timing and occultation timing would have allowed a really accurate
> calculation of a "one way trip" for the speed of light.
>
> I don't know if anyone did that calculation, then or later.  But one of
> you might do the calculation I did regarding a mutual occultation of
> Galilean moons, really accurately, and also observed when it was witnessed
> here on Earth.  I think you could get a really accurate value for the
> one-way speed of light.
>
> Carl Johnson
>
>
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