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How fast is time running?

  1. Sep 28, 2004 #1
    How fast is it?
  2. jcsd
  3. Sep 28, 2004 #2
    Exactly 1 (s/s).
  4. Sep 28, 2004 #3
    estein said speed of time is change with the speed of movement of the object.

    so the speed of time in earth should be different?
  5. Sep 28, 2004 #4
    Sticking to special relativity...

    Experimental facts have shown that intervals of time are different for things that move relative to other things. What Einstein did was to explain it using other experimental facts.

    All frames of reference are equivalent (earth = car = shuttle = particle = baseball = asteroid = random object in galaxy = Random object in Univers = etc.). While 4 seconds tick in one frame, 4.00001 seconds might tick in the other, and 3.554 s in another, and 10 s in another. (all depending on relative speed)

    There is no "speed of time" anymore than there is a "speed of distance". Your question may assume there is an absolute reference frame in which time intervals are more important than in another. This is not the case. (although it was common good sense until 100 years ago, when new phenomena were discovered.)
    Last edited by a moderator: Sep 28, 2004
  6. Sep 28, 2004 #5
    Time is flowing at a rate that is determined by your perception, or the rate at which an instrument may detect constant distance.
  7. Sep 28, 2004 #6


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    Staff: Mentor

    Not quite - since you are at rest relative to yourself (or your watch), you don't notice time dilation.
  8. Sep 28, 2004 #7


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    It could be said that the "speed of time" is c. For two objects that are at rest relative to one another, time progresses at the same rate for both. If one object accelerates to some arbitrary speed, the passage of time for that object (as viewed by the other object) will decrease. This decrease is a function of whatever fraction of lightspeed the first object is traveling. If you look at time as traveling by at lightspeed, you can say that the accelerating object is "catching up" to time. If this object were ever to actually reach the speed of light, time would cease to move for that object. It could be argued that the object has accelerated until it was synchronized with a particular moment, and is not traveling parallel with that moment.
  9. Oct 1, 2004 #8
  10. Oct 2, 2004 #9


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    Isn't there a FAQ on this?
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