Author: Jon G.
Date: Sep 1, 2008 02:36
Any origin is never an infinitesimal point, but a sphere of small radius that forms a basis for measurement. When the radius is small, the sphere approximates an infinitesimal point, and measurements from either the inner or outer surface of the sphere are the same. For a sphere of large radius, events are measured from either the inner or outer surface of the sphere, as well. ...
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