2010/1/9  <ed...@billiau.net>:
> Eg Air navigation east coast north america to europe.
> This is long enough that shown on a Mercator projection the straight line
> which the pilot flies is shown as a curve - because in 3D it is a curve.

Not just a curve, but a S shape when they cross the equator.

You can also see how straight lines curve going from Australia/NZ to
South America when the flight goes past the south pole, the curve
bends very very southwards on a map, but is a straight direction of
flight.

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