On Apr 20, 5:13 pm, "Lee Gordon" wrote:
They would sure appear to be parallel and for all practical purposes would
be, but in truth they would be between 1 and two ten-thousanths of a degree
off.

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.