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spacetime and it is all around us. Dimensionally modeled Time is considered to be the fourth dimension of reality, used to describe changes/events in three-dimensional space. And while we can indirectly experience the reality of temporal differences, the nature of Time is not something we can immediately comprehend via our five senses. The approach of philosophy to Time differs from that of physics. Whenever these differences are disregarded there is a danger to use the same term for differently perceived phenomena and then false conclusions may be drawn. In general, physics operates with actual time concepts, whilst philosophy generally considers time as a potential form of existence.
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define measured time as the progression of changes/events from the past to the present into the future. Change is all about the comparison of something made different to what it currently is; the act or instance of making or becoming different, whether physically or temporally respectively. Consequently, if a system is changing, it has an operational measure of time. Alternatively, if a system is unchanging, it has no operational measure of time. In our world the happening of changes/events assumes that there is an 'arrow of time'. You cannot change something backwards, due to the theory of
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since (30,0) is in the future of (0,0) that the "sun stops shining" event is separated from your current "here and now" reference event by space - although you will observe it in the future after it has happened, it is not causally in your past or future. This situation should be what you meant by "not in their respective light-cones". Now regarding the time coordinate I guess you could say that -450 is less than 0 but generally it is meaningless to compare coordinates like that - I would not say that any of these events are separated by time besides (0,0) and (30,0).
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Yet it is not something we can see, touch, or taste, but we can measure its passage. The approach of philosophy to Time differs from that of physics. Whenever these differences are disregarded there is a danger to use the same term for differently perceived phenomena and then false conclusions may be drawn. In general, physics operates with actual time concepts, whilst philosophy generally considers time as a potential form of existence..
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previous sentences were talking about time as a coordinate, and then time as measured by the clock of each observer, I didn't understand it that way, and had the impression that the example I just gave could be encompassed in "Events can be separated in many directions in space, but if two events are separated by time", since for my
Minkowski coordinates, they are separated by time (in addition to being separated by space).
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happening of changes/events assumes that there is an 'arrow of time'. You cannot change something backwards, due to the theory of causality. Operationally, Time can be best expressed as providing for a measured change. However, the measured change/event only happens within the calculable measure of our conscious memory.
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Submitted View: The
Fundamental Nature of Time The operational definition of measured Time does not address what the fundamental nature of Time is. The fundamental nature of Time is best represented as the allowance/potential of change. Basically, Time is a dimensional constituent of the modeling for
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However the fundamental nature of Time is best expressed as the providing for the allowance/potential of change. Basically, Time is a constituent of spacetime and it is all around us. Time is considered to be the fourth dimension of reality, used to describe changes/events in three-dimensional space.
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as possible while still being correct with the current understanding in physics. So let's turn to your example first. As suggested in the paragraph, every event is assigned time and position coordinates. For simplicity I will use only one position coordinate and assume nothing moves, so observer and
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The dynamic of 'change' is all about the comparison of something made different to what it currently is; the act or instance of making or becoming different, whether physically or temporally respectively. Consequently, if a system is changing, it has an operational measure of time. In our world the
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Now in some sense the sun stopping shining and your observation of it are just different coordinates for the same event - this is the principle of relativity, that time coordinates are not absolute but are a function of the observer. Then regarding space vs. time separation, it should be clear that
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I have in mind an example as the sun stopping to shine. The sun is at a bit more than 8 light-minutes. Now, let say that I'm on Earth, and I describe this event with
Minkowski coordinates centered at me now, for which the sun stops to shine at 30s (for instance). This is typically a case where this
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This seems to be incorrect, or at least misleading for a non-expert. Indeed, the time-separation claim is correct only for two events which are in their respective light-cones, for which the notion of past an future is unambiguous. I.e., if they are separated by a time interval. This is not anymore
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I'm not sure this is necessarily as misleading as you describe: certainly, two observers would need to be in the same light-cone to be able to agree or otherwise ascertain anything meaningful? That is, for every possible observer where the notion of agreement is physically meaningful, this will be
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Alternatively, if a system is unchanging, it has no operational measure of time. Non-operationally, Time can be best expressed as providing for the allowance/potential of change. In a sense, a thing that exists potentially does not exist, but the potential transition does exist. The definition of
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Submitted View: The operational definition of measured time does not address what the fundamental nature of Time is. The operational definition of measured Time does not address why changes/events can happen, or whether they can happen forwards and backwards in spacetime. Physicists operationally
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based on the relation "is caused by". This is a more philosophical notion. It is true that if you have a clock that measures the time of two events, the earlier event causally precedes the other, but this causal definition extends to situations where precise clock coordinates are not present. It
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In this context, I think that I fundamentally misunderstood the current wording. From you answer, I now understand that you used separated in space for space interval, and separated in time for time interval, which was not obvious for me. In this case, I agree with your wording. However, as the
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For the second answer, I hope I have solved our mutual misunderstanding: I was indeed mostly reading "time" as "time coordinate in
Minkowski". You're right, I let aside the possibility of CTC. For the events being "in their respective light-cone", it was a bad phrasing for "each one is in the
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But overall, it's interesting to see that this confusion was mostly due to a bad understanding of what we meant by "time" on the "time" article of wikipedia... Maybe it was also caused by the fact that I learned this topic in French, and that the exact wording we use cannot be literally
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1. "The time-separation claim is correct only for two events which are in their respective light-cones" - I am not sure how an event can be outside its own light cone? The light cone is defined relative to the event. So this boils down to "The time-separation claim is
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Current View: The operational definition of time does not address what the fundamental nature of it is. It does not address why events can happen forward and backward in space, whereas events only happen in the forward progress of time.
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In the "Definition" section, it is written that "Events can be separated in many directions in space, but if two events are separated by time, then one event must precede the other, and all observers will agree on this."
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2. If two events are separated by time, then one event must precede the other and all observers will agree on this. (This is a proposition of special relativity - in general relativity it is not quite true as there are
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In most instances the string "separated by time" is immediately followed by "-like" or " -like", so that does not count, but I found at least one relevant source that explicitly uses the string from the article:
1555:", which is the standard, correct phrasing and which thrives in the literature. I have never seen the shortened form in the literature in its relevant context. Of course the problem is how to talk about a
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2. "The notion of past and future is unambiguous." - not quite, as mentioned there are the CTC's which have never been observed. But if you fix a point on such a loop then past and future are unambiguous.
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place coincide. Let's say you are at position 0 and the sun is at position 8*60=480 light seconds. Then at time t=30 seconds you observe that the sun stops shining. In other words, these are 3 events:
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which just rattles off a theorem "Thus, the causal structure poset (M, ≺) of a future and past distinguishing spacetime is equivalent to its conformal geometry." but maybe it is too technical.
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I think the issue is that there are in fact two definitions of time operating here. First is time as a coordinate, as measured by the clock of each observer. Then there is time as causality, a
1679:. I have revised the whole thing, to add the earlier source I linked - let me know what you think. It should at least be clearer although I fear the wikilinks may make it seem more technical.
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Now, if you think I'm only nitpicking, and I could understand it, no problem :) But if you agree with this potential misreading, maybe a slight modification of the wording could change it.
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3. "If they are out of their respective light-cone, i.e., separated by a space interval, they are not separated by a time interval." (paraphrased) - this is logically equivalent to my (1)
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Buccheri, R. (2003). The Nature of Time: Geometry, Physics and
Perception. Chapter: Potential and Actual Time Concepts: KJuwer Academic Publishers. p. 417. ISBN 978-1-4020-1201-3.
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event is not in the future of the event "here and now for me", from a special relativity view, which is typically what could be confusing for an unfamiliar reader.
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potentiality is the ability to develop or come into existence. Therefore, the nature of Time is its relative potentiality; potential to transition into a
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1. Events can be separated by space or by time. (or as a special case be directly on the light cone, which is both, but I left this out for simplicity).
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For the first answer, I would refer to my example, where the two events "here and now for me" and "sun stops shinning" are not in the same lightcone.
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I also think there is a little problem here. "Events separated by time" seems to be an attempt at nontechnically talking about "events separated by
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If it its is too much detail, the second paragraph can be moved to be a separate subsection under either the section of
Philosophy or Perception.
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And it gives a neat explanation to boot. So I have added it to the article and italicised the term to mark its hidden technical nature:
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First, let me say that I had in mind how unfamiliar readers would read the text, not experts. This maybe caused some confusion.
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I wrote that sentence. I am not clear on what you think is incorrect or misleading. I will break it down. Here is what I wrote
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It's a good source, it still doesn't support what I said though as it ends up defining the intervals as time or space
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Alright, let me see if I understand. The goal here is naturally to make the explanation as un-
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the case if they are out of their respective light-cone, i.e., separated by a space interval.
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Hello. I'm not used to complex modifications in Knowledge, so I prefer to put my remark here.
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That is too much detail for the lead. Further elaborations exist in the body of the article.
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Add new subsection "The Fundamental Nature of Time" under section "Philosophy"
1138:. Operationally, Time can be best expressed as providing for measured change.
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If so, do I have to provide for another edit? How do I proceed?
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1640:(illustrated ed.). Cambridge University Press Archive. p. 125.
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would be good to find some sources for this section. There is
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The Nature of Time: Geometry, Physics and Perception
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1379:correct."
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