Well -- the salesman's watch is traveling together with him at very high
speed, so it measures 'his' personal time. If the salesman looks at his
sundial -- then goes on his fast trip and returns to look again at his
sundial -- is the same thing as leaving a watch in the place and taking
a trip without it. Taking the sundial with him would mean to pack the
earth and the sun in his suitcase and bring it on the trip ...
Werner Riegler
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of anselmo
Sent: Monday, May 30, 2005 10:02 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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