Tell me the position of small and big hand of your watch, which happened simultaneously with the event, in which you look at your watch. Hey I'm just asking what is time??
As per wikipedia: "Time is used to sequence events, to compare the duration of events and the intervals between them, and to quantify rates of change such as the motions of objects."
Aristotle explained, Time is defined as "the number of movement in respect of before and after"
"Time, for Aristotle, is fundamentally linked to change and movement. Where there is alteration or movement, there is time, for everything that comes to be and ceases to be are in time."
Einstein explained time with Simultaneity."The 'time' of an event is that which is given simultaneously with the event by a stationary clock located at the place of the event, this clock being synchronous, and indeed synchronous for all time determinations, with a specified stationary clock."
We often understood time by comparing it with motion of heavenly and celestial bodies across the space. Then we moved to sun-dial, hourglass, water clock and finally clocks and watches. Gradually we cutoff from the original methods and started finding better and precise ideas to synchronise watches and finally so far, today's cesium fountain atomic clock. If Time is the ongoing sequence of events taking place, isn't it we forgot referencing, the abstract Time but with some known motion of sun or interval of events at atomic level etc. The our understanding of time is nothing but the past, present and future. Let us try to understand them in more details.
- Past : It is audit trail of many presents. It is very much related to memory. We often doubt the existence of past if there are no evidences or all relative algorithms of present stands true without it. The relationship of past with present and future is that it comes before/earlier. And we can measure it in duration. It should scale up to infinity but presently we limit it up to little before big bang.
- Future : All possible states that can be created from extending past in scale with present gives us horizon of future. It has no evidences attached with it so we doubt its existence. Its relationship with past and present is that it comes last. Its scale up to infinity but we can measure it too.
- Present : Present is....sorry, Is there a present ?? Present is not present but nearest past that we assume to be happening 'now'. Before we sense the truth of present, it has already became past. But still present is not imaginary. It is that point which separates future from past. And this point is micro sorry nano, pico, fepto or very very very smaller than yoctosecond in sharpness. Perhaps it will be unwise to measure it. Unlike past and future we can not measure the present. Present is nothing but just the feeling that one selected future is being audited as past. Our action in present has nothing to do with what happening now but an action to filter out one future from small band of near futures which is again filtered result of infinite possibilities of futures.
Unfortunately Hubble's finding came little late after the Einstein had published his theory of relativity and time. Otherwise Einstein might has accounted the space expansion also while defining his theory of Simultaneity. But still with all the findings he had with him during his work on relativity he concluded that there is nothings as the 'now' at all. There is no absolute time, not even 'rest-system time' is absolute time. It depends on motion of observer. Even very small relative difference in motion can result significant difference in time-ordering. If observed from distance event A,B and C might occur as A,C and B to other observer due to relative motion differences. There is very much possibility that our 'now' is different than that of other's. Generally clocks are nothing but referencial way to synchronize 'now' or 'nows' :-). “That meeting starts at 9 o'clock,” is being explained as “The pointing of the small hand of watch to 9, bigger hand pointing to 12 and the start of the meeting are simultaneous events." But time is space expansion; motion and force due to it.
Lets assume if there is no time then world would be in pause mode. There will be motionless universe(not multi verse). No force applied or felt. Just like a picture. We will be seeing this world exactly how it appears to photon(may be will talk some other time that photons should or shouldn't be independent of time). May be the universe is nothing but timeless pictures and we are just able to relate it with previous picture because of memories. Remember second law of thermodynamics: Entropy is tendency of a particle(information in our case) to move from higher levels of organization and structure to lower levels. Here past(single) is higher level of state and future(multiple) is lower level. So by laws it is possible for information to travel from past picture to present. And we are able to sense motion in it as we sense motion in still images films in projector.
I'm confused with time and expansion of space or call it motion pictures.
"Time Is Only What Prevents Everything From Happening At Once."
As you can see now, I'm really confused. And I apologize as I'm confused who said above line John Wheeler,Albert Einstein or Ray Cummings.
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