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A knot is one nautical mile per hour (1 knot = 1.15 miles per hour). The term knot dates from the 17th century, when sailors measured the speed of their ship by using a device called a common log.. This device was a coil of rope with uniformly spaced knots, attached to a piece of wood shaped like a slice of pie.
How fast is a knot? In this video, 3QuickPoints converts knots into kilometers per hour and miles per hour, then talks about maritime history. 1  Howto & Style. 2  Standard YouTube License.