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Ping + measure circumference of earth

  1. Sep 2, 2005 #1

    ranger

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    I can remember reading somewhere that the ping command can be used to measure the circumference of the earth or something similar. Does anyone know how to do this, or have a link to the article?

    --thanks
     
  2. jcsd
  3. Sep 6, 2005 #2
    I doubt it...

    the "Ping" command is just a ICMP echo request, each device you ask for the echo will respond quicker or slower depending on cetain factors such as:

    Speed of links between your device and end device
    Router Ques between your device and end device
    Router CPU use between your device and end device
    End device CPU use

    etc etc

    So IMO there is no way one could concievably (using the internet) calculate the Cirumference of the earch using ICMP... Too many external factors would corrupt your data
     
  4. Sep 6, 2005 #3

    ranger

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    I've googled for it, but nothing. Hey but I did read something (I guess).
     
  5. Sep 13, 2005 #4
    Methodology,
    1. Buy two computers
    2. Buy very long lan cables!!
    Connect the two PCs on lan with the wire going around the earth. (Make sure there are sufficient repeaters in between). Ping the second PC from the first PC and calculate the delay in response. Given that the speed ofelectrons through a lan cable is normally around (2/3)c. One can easily calculate an approximate figure for the circumference of the earth.

    -- AI
    P.S-> Note that the above methodology is still under development and my stupid sidekick is constantly suggesting , "why not just measure the length of the cable?". Pfft! who has heard of such a dumb idea of calculating circumference!!
     
  6. Sep 13, 2005 #5

    ranger

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    Insead of that, is it possible to bounce the connection around until it eventually reaches around the earth? Or just get the ip address of a comp halfway around the earth and ping that . Then double the delay responce time.
     
  7. Sep 13, 2005 #6
    I could ping the a website which is set up next door to me and it could bounce half way around the world before it got to the website and return a ping response.
     
  8. Sep 13, 2005 #7

    ranger

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    When you ping computer, should it find the shortest possible route to the target computer?
     
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