You can calculate the length of a degree latitude/longitude here
http://msi.nga.mil/MSISiteContent/St...rs/degree.html
Length of a degree of latitude - nautical miles
0°
zzzzzzzz59.7052508693788
10°
zzzzzzz59.7233545410539
20°
zzzzzzz59.775526031
30°
zzzzzzz59.855511344
40°
zzzzzzz59.953929486
50°
zzzzzzz60.05893078237827
60°
zzzzzzz60.15784266125807
70°
zzzzzzz 60.238650868
80°
zzzzzzz60.291480673
90°
zzzzzzz60.309913503
Difference of 3,674 feet between 0° and 90°
Length of a degree of longitude at the equator is 60.10764611706782 nautical miles.
Got to get a life