You would be approximately 35 degrees S, 0 degrees E, or 2439 miles south of your starting position, assuming the earth is a sphere with a circumference of 24,901 miles. After traveling 2439 miles north, you would be at 35 degrees N, 0 degrees E. After turning 60 degrees counter clockwise and traveling 4878 miles, you would be at 35 degrees N, 90 degrees W. Turning 60 degrees counter-clockwise and traveling another 4878 miles, you would arrive at 35 degrees S, 90 degrees W. Finally turning 60 degrees counter-clockwise and traveling 2439 miles you would arrive at 35 degrees S, 0 degrees W. If you returned to your starting position, you will have traced out a spherical square.