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Where is Earth's center of mass?

  1. Jun 22, 2010 #1
    As a first-order approximation I can simply calculate the location and radii of an ellipsoid that contains the center of mass, but that's not good enough. Doing a Google search for "center of mass earth" doesn't pull up anything.
  2. jcsd
  3. Jun 22, 2010 #2

    Doc Al

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    Staff: Mentor

    It's unclear what you are looking for. Are you looking for the actual location of the earth's center of mass, taking into consideration non-uniform distributions of mass density? (As a first approximation, why not say right in the middle! :smile:)
  4. Jun 22, 2010 #3
    Why are you looking for this information, the center is a very good approximation...
  5. Jun 22, 2010 #4
  6. Jun 22, 2010 #5


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    Gold Member

    What coordinate system would you use to define the location of the centre of mass?

    I mean, would you say it's X miles from the North pole at sea level, Y miles from 0 lat 0 long?

    The coordinate system is the surface of the Earth, which is not a sphere?
  7. Jun 23, 2010 #6

    D H

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    That's the wrong search term. The right search term would be "geocenter" were it not for a slew of companies and organizations that erroneously think they are the center. You'll get a lot of irrelevant garbage if you just search for "geocenter".

    Try searching for "geocenter motion" or "geocenter variations".
    Last edited: Jun 23, 2010
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