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Re: How many miles?
If I remember my spherical trig correctly, one could use the spherical law of sines.
The angle between the intended course and actual end point will be 90 degrees or pi/2 radians
Spherical law of sines says A/a =B/b=C/c where A, B, C are arc lengths of a triangle and a, b, c are angles in radians.
So, a is 1 degree or .0174 radians (from 2pi radians in a circle) so with a tiny bit of algebra you get:
A=2Ba/pi (B is half the circumference of earth or12000 miles)
A= 2*12000*.0174/3.14=133 miles.