Re: Who?

Den 26.08.2024 13:02, skrev Richard Hachel:

Le 26/08/2024 à 12:33, "Paul.B.Andersen" a écrit :

Den 25.08.2024 23:10, skrev Richard Hachel:

I notice in my telescope that when my watch marks
00:00'08" the lunar clock is desynchronized and marks 00:00'07".

>
So the first point you have to clear up, is:
>
Why do you _guess_ that if you look at the lunar clock with
a telescope, then you would see that it lagged 1 second on
the clock at your table?
>
When you have explained this, we can take it from there.

 Ah, but here is my explanation! Thank you sir!
There is a one-second time difference between 00:00:08 and 00:00:07", between my watch and the watch on the moon.
This is because of the speed of light, which is quite slow, and takes at least a second to reach me.

Thanks for a clear explanation.
You don't _guess_ that if you look at the lunar clock with
a telescope, then you would see that it lagged 1 second on
the clock at your table.
You _know_ that since the speed of light is c, then the image of
the lunar clock you see in the telescope is delayed by 1 second.
That means that when the clock you see in the telescope is showing
00:00:07, you _know_ that the lunar clock is showing 1 second more, namely 00:00:08, which is the same as the clock on your table.
So you know that the clocks are still synchronous.

And so that explains everything.
It's magnificent, I understand better.
Here it is, my explanation.
I am infinitely grateful to you... So that was it!

Quite.
Thanks for the explanation.
But why did you say that you could change the reading
of the lunar clock by looking at it, when you know you can't?
--
Paul
https://paulba.no/