Where is Earth's center of mass?

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Discussion Overview

The discussion revolves around the location of Earth's center of mass, exploring both theoretical and practical aspects of determining this point. Participants consider the implications of mass distribution and the appropriate coordinate systems for defining the center of mass.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest calculating the location and radii of an ellipsoid to approximate the center of mass, but express that this may not be sufficient.
  • There is a proposal to consider the actual location of the Earth's center of mass, factoring in non-uniform distributions of mass density.
  • One participant questions the necessity of seeking this information, asserting that the center is a good approximation.
  • Another participant raises the issue of defining the center of mass using a coordinate system, questioning how it would be expressed in relation to geographical landmarks.
  • A suggestion is made that the term "geocenter" might yield better search results than "center of mass," although it is noted that this term can lead to irrelevant information.
  • Participants discuss the potential confusion surrounding the term "geocenter" and suggest alternative search terms to find relevant information.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and methods for determining the Earth's center of mass, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

There are unresolved assumptions regarding the mass distribution of the Earth and the implications of using different coordinate systems for defining the center of mass.

moonman239
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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.
 
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moonman239 said:
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.
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:)
 
Why are you looking for this information, the center is a very good approximation...
 
Doc Al said:
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:)

Yes.
 
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?
 
moonman239 said:
Doing a Google search for "center of mass earth" doesn't pull up anything.
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".
 
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