I know some bores so good that 100 seconds passes, and I shake my watch ~ 1 second has passed, so there is a subjective localised field around some people..
To a local observer yes, but to someone moving at a different speed no! FloatHeadPhysics does a good job explaining some of this https://youtu.be/OpOER8Eec2A
Only if you disregard observers in different frames of reference interacting with each other, which you shouldn't when you need high precision and it comes to projects spanning Earth, Earth orbit, and the Moon.
GPS wouldn't work without accounting for relativity, for example.
Yeah, I guess I don't see what's funny about that statement.
Unlike "sometimes a second is longer than a second" (not literally true but it makes some sense in the context of relativity), this one just seems like a tautology to me.
Yeah, it might not be funny, but the tautology draws attention to the fact that there is no privileged frame of reference.
In other words, the only thing we can say without qualification is that a second is just a second in the same frame of reference. All other statements must be heavily qualified.
Even things like "A's second is longer than B's" are only valid in some frames of reference and not others.
But you can observe somebody or something in an accelerating frame having experienced time at a different rate.
In the twin paradox thought experiment, one of the twins really has aged slower than the other (or, from their point of view, the entire earth has aged faster than themselves).
In that sense, relativity has effects more tangible than distortion of observations across a large distance.
