Re: Location

Am Montag000027, 27.05.2024 um 08:46 schrieb Thomas Heger:

Am Sonntag000026, 26.05.2024 um 07:59 schrieb Maciej Wozniak:

W dniu 26.05.2024 o 07:40, Thomas Heger pisze:

Am Freitag000024, 24.05.2024 um 21:05 schrieb neus:

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Given three or four coordinates one can find most things in space.
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What if those coordinates are jittery, due to the ripples in spacetime, caused by gravity waves, how does one find an electron.

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Coordinates always refer to a coordinate system.
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A coordinate system has a zero point and a number of axes, which are somehow normed and defined.

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Taking it short - coordinates are tools, designed mainly
to locate things, and, just like other tools, con work
in some cases and can't work in some other cases.
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 Well, more or less.
Coordinate systems are man-made constructs and only imaginary.
 The points in space are actually real, but carry no tags (or similar) which tell the coordinates.
 Sinse the points don't know where they are, we can measure their location only in repect to something else.
 This 'something else' is what we usually use to define a coordinate system.

Usually I use a principle I call 'subjectivism'.
This is based on a priciple, that all inertial observers are of equal rights.
That's why I place the observer in the center of the system in question and measure everything in respect to the observer (or the associated coordinate system).
This makes the observer stop and everything else move.
This scheme is strictly subjectivistic, because one observer can be placed at the zero spot, but not two (or more).
The space seen from there is then the past light cone of that particular observer and usually called 'universe' (though not universal).
That's why we have an infinite number of different universes.
This scheme is not correct, but matches the subjectivitic view, which we usually have upon the world around us.
Since the observer does not move at all (by definition), he (or she) cannot possibly move with c (or any other velocity).
Now the observer has a point, which is already known (the tip of his own nose) and he could measure everything else from there.
Other points are less easy to find, like e.g. 'the center of the universe', or much less easy to use (e.g. the sun).
TH