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"Degrees of longitude vary from nothing at the poles, up to 69.07 statute, or 60 geographical or sea-miles, at the equator. We are now in about 15° north latitude; and a degree of longitude is 66.65 statute miles, or 57.9855 sea-miles, near enough to call it 58. By the way, Louis, multiply the number of statute miles by .87, and it gives you the sea-miles.
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