The formula looks close to right for the time dilation effect, as if
quoted from memory.
I think it was supposed to be "delta Tau = delta t times the square root
of (one minus v squared over c squared)".
Dave
Werner Riegler wrote:
This sounds very interesting. However -- the formula quoted below is
completely wrong in this context and has nothing to do with relativity.
Does it say that it has to do with relativity ? To me it looks more like
a formula for the effect of Abberation. Could you send me the picture of
the dial ?
Thanks Werner
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Roger Bailey
Sent: Monday, May 30, 2005 7:15 PM
To: anselmo; [email protected]
Subject: RE: Relativistic sundial
I was surprised recently to see a sundial that has a relativistic time
dilation correction. There is a dial by "Atelier Tournesol" in the
hamlet of Les Vigneaux, Vallouise, Haut Alpes. It is a triangular North
east facing vertical declining on the old presbytery across from the
church clock tower with a pair of corner VD dials. Above the dial is the
equation "delta tau = square root(delta t -((V(t)/c))). Text does not
render it very well but in looks like relativity to me.
The dial, dated MCMLXXXIX, has both classical and republican hour
markings (decimal hours) so someone has had fun with this dial design.
Picture available on request. SaF catalogue # 0518002.
Regards,
Roger Bailey
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of anselmo
Sent: May 30, 2005 1:02 AM
To: [email protected]
Subject: Relativistic sundial
Dear all,
Everybody knows the story of a salesman
that, after having been travelling at a
very high speed, discovers that his
wrist-watch is delayed respect the
rest of the world's, isn't it?
But what if his wrist-watch
were a sundial? Obviusly it can't
be delayed so... what has happened?
Anselmo
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