Unlike lines of longitude, which converge at the Earth's poles and whose distances from one another depend on your exact position on the globe, the distance between two lines of latitude are constant no matter where you are. A single degree of latitude is equivalent to 69.2 miles. If you need to figure out how the distance between two measurements of latitude, therefore, it is a simple matter of subtraction and multiplication.
Instructions
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1
Measure the latitudes of the two locations in question as accurately as you can using your ruler.
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2
Subtract the lower degree of latitude from the higher degree.
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3
Multiply your result by 69.2 to get the distance between the two latitudes in miles.