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