difference of longitude

The Sailor's Word-Book

The difference of any place from another eastward or westward, counted in degrees of the equator: that is, the difference between two places is an arc of the equator contained between their meridians, but measured in space on the parallel. Thus the difference of a degree of longitude in miles of the meridian would be


At 20° lat. 56·4 miles

" 40 " 38·6 "

" 60 " 30·0 "

" 80 " 10·4 "

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