Re: [Phys-L] field of an ellipsoidal distribution

[Chuck Britton <britton@ncssm.edu>]

But, in general, a Vertical Line doesn’t intersect this Center.

Right?

> On Aug 14, 2015, at 3:50 PM, John Denker <jsd@av8n.com> wrote:
>
> On 08/14/2015 12:36 PM, A. John Mallinckrodt wrote:
>
> > I don't even know how to define "center of the Earth" or "radial."
>
> If you can define "equator" and define "axis" then you
> can define a center.
>
> In fact all of those thing are known quite precisely.
>
> More specifically, all modern geodesy is referenced to 
> a geoid, for which the center (and other details) are 
> verrrry precisely defined.  The definitions are good
> within fractions of a millimeter, and are consistent
> with the relevant benchmarks within a meter or so.
>  https://en.wikipedia.org/wiki/World_Geodetic_System
>
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