Post by Maciej WozniakPost by gharnagelCommon sense was warning your idiot guru.
St. John the Divine was warning Warped Wozniak, the
St John (fuck his absurd threats anyway) won't
help, t'=t in GPS, at least if by t, t' we
mean clock indications.
How such t and t' are clock indications.
According to the own definition of
your [Einstein] - time is "what clocks
indicate",
Don't be lazy, Wozniak, read! "time is "what clocks indicate" is
quite a rough abstract for this:
""""
If we wish to describe the motion of a material point, we give the
values of its co-ordinates as functions of the time. Now we must bear
carefully in mind that a mathematical description of this kind has no
physical meaning unless we are quite clear as to what we understand by
“time.” We have to take into account that all our judgments in which
time plays a part are always judgments of simultaneous events. If, for
instance, I say, “That train arrives here at 7 o'clock,” I mean
something like this: “The pointing of the small hand of my watch to 7
and the arrival of the train are simultaneous events.”3
It might appear possible to overcome all the difficulties attending the
definition of “time” by substituting “the position of the small hand of
my watch” for “time.” And in fact such a definition is satisfactory when
we are concerned with defining a time exclusively for the place where
the watch is located; but it is no longer satisfactory when we have to
connect in time series of events occurring at different places, or—what
comes to the same thing—to evaluate the times of events occurring at
places remote from the watch.
We might, of course, content ourselves with time values determined by an
observer stationed together with the watch at the origin of the
co-ordinates, and co-ordinating the corresponding positions of the hands
with light signals, given out by every event to be timed, and reaching
him through empty space. But this co-ordination has the disadvantage
that it is not independent of the standpoint of the observer with the
watch or clock, as we know from experience. We arrive at a much more
practical determination along the following line of thought.
If at the point A of space there is a clock, an observer at A can
determine the time values of events in the immediate proximity of A by
finding the positions of the hands which are simultaneous with these
events. If there is at the point B of space another clock in all
respects resembling the one at A, it is possible for an observer at B to
determine the time values of events in the immediate neighbourhood of B.
But it is not possible without further assumption to compare, in respect
of time, an event at A with an event at B. We have so far defined only
an “A time” and a “B time.” We have not defined a common “time” for A
and B, for the latter cannot be defined at all unless we establish by
definition that the “time” required by light to travel from A to B
equals the “time” it requires to travel from B to A. Let a ray of light
start at the “A time” $t_{\rm A}$from A towards B, let it at the “B
time” $t_{\rm B}$ be reflected at B in the direction of A, and arrive
again at A at the “A time” $t'_{\rm A}$.
"""
and that's what GPS time is.
I would bet the idiot repeated it after
someone wiser, but still.
But, most the time, clock indications vary a lot.
Just not in GPS.
Oh, so event GPS does not shows t'=t anymore, Wozniak? Sad :-)