Re: Simple Sagnac


"sal" <pragmatist@xxxxxxxxxx> wrote in message
news:pan.2005.08.02.15.03.18.530884@xxxxxxxxxxxxx
| You must be right; I must be stupid. Nothing else would explain my
| wasting yet more time looking over this post of yours again. Be that
| as it may, that's what I'm doing, and I saw a couple of items worth
| additional comments...

[snip, cutting to the chase]

| With x held fixed at 60, when t=4, tau=-4. Got that?
| It's not 8,
| it's -4.

Negative velocity you can have, but negative time? No way.


| In the frame of the train, the event at those coordinates
| had already happened before the train left the origin.

Now you are REALLY being silly.

|
| On the other hand, at time t=4 the light ray was actually at x=20
| ... it hadn't gotten to x=60 yet, and wouldn't for quite a while.

True enough. The light reaches 60 at t = 12.
Then it returns to 60 at t = 20.
tau (60,0,0,12) = tau(60,0,0,20)
What is the (so-called linear) function tau?

[snipped the rest, unread, you are short of time and that is enough for
you
to get on with, you don't read my posts anyway]

Androcles.



.

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