Demo One How to measure of Latitude & Longitude!
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The Earth is not a Sphere - it is an "Oblate
Spheroid - it is 134.397 Km further around
the Equator than it is around the Poles.
ALL VALUES ARE ROUNDED TO THE NEAREST .01
AT THE EQUATOR
One degree of latitude =  110.57 km or  68.71 mi
One minute of latitude =    1.84 km or   1.15 mi
One second of latitude =   30.72 m  or 100.77 ft
One degree of longitude = 111.32 km or  69.17 mi
One minute of longitude =   1.86 km or   1.15 mi
One second of longitude =  30.92 m  or 101.45 ft
AT LATITUDE 40 DEGREES (NORTH OR SOUTH)
One degree of latitude =  111.03 km or  68.99 mi
One minute of latitude =    1.85 km or   1.15 mi
One second of latitude =   30.84 m  or 101.19 ft
One degree of longitude =  85.39 km or  53.06 mi
One minute of longitude =   1.42 km or    .88 mi
One second of longitude =  23.72 m  or  77.82 ft
AT LATITUDE 80 DEGREES (NORTH OR SOUTH)
One degree of latitude =  111.66 km or  69.38 mi
One minute of latitude =    1.86 km or   1.16 mi
One second of latitude =   31.02 m  or 101.76 ft
One degree of longitude =  19.39 km or  12.05 mi
One minute of longitude =    .32 km or    .20 mi
One second of longitude =   5.39 m  or  17.67 ft
AT THE POLES
One degree of latitude =  111.69 km or  69.40 mi
One minute of latitude =    1.86 km or  1.16 mi
One second of latitude =   31.03 m  or  101.79 ft
Diagram is
exaggerated
(red line is a circle.)
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