1. Ok, so all clocks start off at zero.
Yea Ros, so to speak
2. One clock is on Mars (5 light minutes from Earth) and the other two are on Earth.
Al's is certainly on Earth; at least one on Mars left behind by Marty, and we can presume that he and Isaac each carries one in his ship for a total of 4 clocks
3. Two clocks (one on Earth and the other on Mars) switch position at approximately the speed of light.
Not quite sure Ros what you mean by that
4. After everything arrives at its destination,...
Not sure what you mean by that either. But let's assume it means the moment Isaac reaches Mars
….the two clocks on Earth read 5 minutes and 0 minutes (approximately).
By classical relativity Al's reads 12:05 while we don't know about Marty's because we never decided whether he had stopped to visit with Al. At noon when he arrived at Earth 5 minutes ago it had read 11:55
The clock on Mars reads 0 minutes,
it reads 12:05
but only the person on Mars can see it.
Two if you include Isaac at his arrival. Marty had of course departed 5 minutes ago but there's Marty's mate Marsha
5. If the person on Mars reports his [her] reading (of zero)
then it takes 5 minutes for the message to reach Earth
Yes by classical relativity, I presume Ros you mean Marsha's message announcing his arrival
...and by then the two clocks on Earth read 10 minutes and 5 minutes.
Al's reads 12:10 but of course Isaac's long gone and probably Marty too
Do you agree or disagree with that?
Agree only partly and based on certain assumptions above. I assume what you mean by 10 min having elapsed that upon receiving Marsha's message Al's reads 12:10 of course
I'm still trying to figure out what your argument is.
With this posting we haven't yet discussed my "argument", which I thought I had already described by earlier postings, in some detail, at least twice
In my "argument" destinations don't much matter and so we've spent a lot of unnecessary time describing Isaac's trip and his encounter with Martha. At noon Al's time classical time-at-a-distance places the reading of Marty's clocks back home at 11:55 (as reported by Marty zipping past) while Isaac reports, "I judge it to be reading 12:05" (in spite his own, naturally, still reading noon)
Thus at Noon Al's time it's 12:00 plus or minus five minutes on Mars. We don't know if it's noon there of course since we can't determine the planet's attitude toward the Sun
Now, my crazy view places special emphasis on Isaac's observation because it seems to make so much more sense of Al's slightly later report describing the changes seemingly having taken place in Isaac and his ship at his takeoff
For instance: When Isaac almost instantaneously (to him) arrives at Mars, his own clock of course still reading 12:00--by classic theory everyone agrees upon (except maybe me)--it's because it had been stopped throughout the trip
I merely propose instead Issac be allowed to judge his trip seemed so quick because his speed was so great, not infinite of course, but many, many times c (the two ships being really remarkable devices, certainly)
At risk of repetition still again, another way to express it: At any point in the Universe the time at distance d is d/c later
.....so velocity measured by conventional means is underestimated
Again, once more, repeating, my posit doesn't refute Einstein's relativity but only provides a skewed way of looking at it in order to satisfy intuitive requirements puzzled by all those peculiar changes. Hence relative relativity
Of course I could be dead wrong through some technicality of which I'm yet unaware. Still, it so easily explains Time Dilation, Length Contraction, and Mass Accretion that it ought to be entertained with the notion of gaining possible new insights
There's just a whole lot gone by the board, to be sure. For instance, Isaac reports the distance to Mars instead of 60 million miles to instead 13 ft, 6-1/2 in., with Marty's home planet flat as a pancake. But detail of this sort only introduces extraneous complication
Ros thanks once more for the opportunity to shoot off my old mouth