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Re: A Geometrical Proof of the Non-invariance of the Spacetime Interval



Relativity does not put the location of your breakfast in two different
places. Breakfast occurred where it occurred, at a particular time. Both
sets of observers agree that breakfast occurred at Los Angeles, at you. At
lunchtime, you are now in San Diego, but that does not put the location of
breakfast in San Diego. The earthbound observer still says your breakfast
occurred in Los Angeles, and you happenned to be at that location at
breakfast time. You say breakfast occurred at you, and at the time of
breakfast Los Angeles happenned to be at your location. From your point of
view, Los Angeles has moved. From the earthbound point of view, you have
moved. None of that changes the location of breakfast (the event, not the
food:)), which was an event occurring at a particular place and a
particular time.

In the first sentence quoted below, it is not meaningful, really, to ask
"at the time of your lunch, ...what is the location of your breakfast...".
Instead, ask "what WAS the location...".

Michael Burns-Kaurin



David Rutherford wrote:

According to relativity, at the time
of your lunch, if I am asked what is the location of your breakfast, I
say it's Los Angeles, but you say it's the location of you, which is now
San Diego. Relativity puts the location of your breakfast in two
different places. That means that the location of your breakfast,
according to relativity, is not at the same place in spacetime.