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On Aug 14, 2015, at 12:51 PM, John Denker <jsd@av8n.com> wrote:
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