"Robatoy" wrote in message

If we are going to split hairs then:

The error from the theoretical parallels would vary both with altitude
and location on the globe.
A geodesic error will cause different errors on the two strings as the
earth is not a perfect sphere.

Not only that, but you would certainly need to do gravity meter surveys to
insure that the gravity field is equivalent at both locations prior to
embarking upon any calculations.

You can't be too careful ...

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