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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? This may be more of a question as to what is a knot. Donât imagine the conversation centers on an actual knot, like a Windsor knot for your necktie or those fancy knots sailors make. Though the question how fast a knot is does involve the sailing world, more appropriately the nautical world. A knot (equal to one nautical mile per hour) is used to describe the water speed of a vessel. So, a knot is considered a unit of speed (not talking amphetamines here either).