Time and its effects

Time travel is a difficult concept to accept even now...duration is measured by the clock and calendar, in physics though, time is simply a result of location....

I don't know about wading across a stream.

You are correct, you only measure duration, just as you only measure length. There is no absolute reference point for location or even velocity. I suppose there is an absolute time, the big bang, but the JWST is telling us we aren't even close to knowing when that was.

We can measure duration quite accurately, for example, with a Cesium clock.

"One second is the time that elapses during 9,192,631,770 (or 9.192631770 x 10⁹ in decimal form) cycles of the radiation produced by the transition between two levels of the cesium-133 atom."

https://www.techtarget.com/whatis/definition/second-s-or-sec#:~:text=Katie%20Terrell%20Hanna-,What%20is%20a%20second%20(s%20or%20sec)%3F,of%20the%20cesium%2D133%20atom.

I stick with the physicists, philosophers only confuse me...

How do you know that the Cesium Clock is behaving in a regular beat of always equal duration / frequency ?

If you think this is BS, please forgive me.

I'm not claiming to have an answer. But, something to think about is a philosophical question: Does/can time exist without any way to measure it? In other words, will destroying your clock destroy time? Will "not having a tape measure" destroy length? If Time is one of the dimensions, then it still "is what it is" regardless of measurement methods. If you really want to know what Time is, then studying its method of measurement will not give you the answer. You should ask questions like, "Does Time depend on anything else to exist? (for example, an observer, like quantum physics requires); Or, "If Time is a dimension, does that mean Time is a characteristic of something else,or is it a "thing" in its own right? (or vice versa)"; Or for that matter, "Does Space depend on length, or does length depend on Space (or are they one and the same thing). And, how does that answer apply to Time?"; Or even, "What is a dimension, really, anyway? A dimension of what? Doesn't a dimension depend on the thing within the dimension? Or, does that thing depend on the dimensions? Can they be separated from each other?". Which is the "thing", and which is the characteristic? How do you know if you're really measuring the "thing", or its characteristic?

An overnight flight from Vancouver to London leaves at 21:00 and is due in London at 08:00 the next day.

An observer in northern Greenland gets woken by its passing overhead at 03:30.

At that moment, what time is it inside the aircraft (rhetorical question - NNTR)?

Time is a matter of personal experience, and is the concept only of the observer and the time zone in which the observer is located. "Clocks back one hour", or the equivalent in the local language, is a sign that can be found in many locations when one is travelling west on land across time zones.

I've been on one of those flights, wishing it were time for a meal, only to be told to change my watch.

And, by the way, what time is it on the North or South pole?

Time is a matter of personal experience, and is the concept only of the observer and the time zone in which the observer is located.

I think that may be what Bergson was getting at.

A E had it right:Time is relative.

"A clever Professor named Bright

could travel much faster than light.

He left one day

in a relative way

and came home the previous night."

_{- Anon}

I have from time to time, pondered the passage of time . . .

Conceptually speaking and in this limited realm in which we live; time is the distence between cause and effect. When cause and effect are one time ceases to exist.

https://www.youtube.com/shorts/wGHhQMe5Qbs?feature=share

IMHO:Time is a measure of at least 2 events.One event is the reference,and the other is the measured event.

So the question is could one measure time with any events?

I think not.

Even the atomic clocks have a reference,and in order for a device to be a valid reference,for NIST Standards,it must be at least (3 or 4, I am not sure) times more accurate than the measured device.

So what is more accurate than the cesium clock by which they measure it?They measure it by comparing to another reference--what reference?

They are still comparing 2 devices(events) arbitrarily.

So Albert was right..time is relative to one's perspective of other events;No events, no time.

There was no time before the BB,(Or whatever thumped the first domino from which all other events are caused);No events to measure,and no events beyond the EH of a Black Hole.

Okay,I have just vented my opinion on time and events.(pardon the pun).

Time is just Mother Nature's way of keeping everything from happening all at once.

ξ