What exactly IS time?

Discussion in 'Science' started by DarwinParty, Oct 23, 2011.

  1. MrNick

    MrNick Banned

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    C'mon, you're just wrong here...

    Of course what I'm talking about is really just time dilation, however the idea certainly belongs in this debate..

    I mean it is FACT that satellites need atomic clocks due to time dilation because they're traveling faster than the objects they communicate with on Earth like GPS for example...
     
  2. 10A

    10A Chief Deplorable Past Donor

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    It's not a fact. Satellites don't need atomic clocks due to time dilation, they use atomic clocks because they last a long time and are highly precise. That has nothing to do with time dilation nor that they're traveling fast.

    For GPS, the clocks are slowed down before launch so they tick at the same rate as clocks on Earth. GPS receivers handle the Special Relativistic effects of the moving satellites. The receiver has to do this because the satellite could be moving towards, away, or be directly overhead. The receiver knows where the satellites are through the ephemeris broadcast.

    I don't know what that has to do with "time is movement", "speed is time", "gravity is time". That would mean speed is gravity, and it just isn't so....acceleration would be closer to gravitation.
     
  3. MrNick

    MrNick Banned

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    You do realize satellites need atomic clocks because of time dilation?

    https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=gps+time+dilation

    You do realize that google search has 60,000 sources that confirm everything I am saying?
     
  4. 10A

    10A Chief Deplorable Past Donor

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    No they don't, they need atomic clocks because of their precision. The receiver has to triangulate with 4 satellites to determine position. If the clocks on those 4 satellites are off even a little bit the location will be off by a lot (1ms deviation can cause 200 miles of error). If relativistic effects didn't exist the same error would exist with an inaccurate clock.

    If the high precision wasn't required, we could ignore the relativistic effects. It's exactly the need for such precision, with an atomic clock, that requires us to take relativity into account. You have it backwards.

    Linking a Google search isn't really proof of anything, other that you can type a search term into Google. See how it works: https://www.google.com/#q=gps+satellites+need+atomic+clocks+for+precision I got 175,000 results, I win.
     
  5. MrNick

    MrNick Banned

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    Ok, are you trying to assert time dilation doesn't exist?
     
  6. 10A

    10A Chief Deplorable Past Donor

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    No. I already stated the atomic clocks on GPS satellites are slowed down prior to launch, to account for General Relativity. The time effects due to Special Relativity are handled by GPS receivers.
     
  7. MrNick

    MrNick Banned

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    Yea, to adjust for time dilation due to the effects of the rate of speed they're traveling...
     

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