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The north south position on the surface of the Earth is specified by the geographic coordinate called latitude.
The latitude of a point on the Equator is 0 and for a point on the poles the latitude is 90 degrees.
If the latitude of Chicago is 42 degrees and the radius of the Earth is 4000 miles, the distance between Chicago and the Equator is equal to D = `(2*pi*4000*42)/360` = `(2800*pi)/3` miles
Chicago is approximately `(2800*pi)/3` miles from the Equator.
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