The units involved in this conversion are knots and kilometers per hour. This is how they are defined: Knot

After what seems like hours, the heart note gently transitions into the base note. Vanilla, amber, musk and a breeze of cedar now dominate. Equal, no captain to be seen, they rally spicily around a residue of sweet saltiness and let the long, sunny day pass in review, until it's time to retire to the bunks. Mind you, until that time comes, it takes and takes and takes ...

40 kn from similar units:

This scale is also widely used in the Netherlands, Germany, [14] Greece, China, Taiwan, Hong Kong, Malta, and Macau, although with some differences between them. Taiwan uses the Beaufort scale with the extension to 17 noted above. China also switched to this extended version without prior notice on the morning of 15 May 2006, [15] and the extended scale was immediately put to use for Typhoon Chanchu. Hong Kong and Macau retain force 12 as the maximum. [ citation needed]

The units involved in this conversion are knots and miles per hour. This is how they are defined: Knot The knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph. The ISO Standard symbol for the knot is kn. The same symbol is preferred by the IEEE; kt is also common. The knot is a non-SI unit that is "accepted for use with the SI". Worldwide, the knot is used in meteorology, and in maritime and air navigation—for example, a vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour. Etymologically, the term derives from counting the number of knots in the line that unspooled from the reel of a chip log in a specific time. The air is filled with foam and spray; sea is completely white with driving spray; visibility very seriously affected The scale was devised in 1805 by the Irish hydrographer Francis Beaufort (later Rear Admiral Sir Francis Beaufort), a Royal Navy officer while serving on HMS Woolwich. The scale that carries Beaufort's name had a long and complex evolution from the previous work of others (including Daniel Defoe the century before) to when Beaufort was a Hydrographer of the Navy in the 1830s when it was adopted officially and first used during the voyage of HMS Beagle under Captain Robert FitzRoy, later to set up the first Meteorological Office (Met Office) in Britain giving regular weather forecasts. Definition: A knot (symbol: kn or kt) is a non-SI unit of speed at sea. It is defined as one nautical mile per hour, where a nautical mile is 1,852 meters. A knot is equal to 1.852 kilometers per hour and 1.15078 miles per hour.The Beaufort scale / ˈ b oʊ f ər t/ is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale.

Exceptionally high waves; small- and medium-sized ships might be for a long time lost to view behind the waves; sea is covered with long white patches of foam; everywhere the edges of the wave crests are blown into foam; visibility affectedSailors determined the speed in “knots” based on the number of knots pulled into the water in a half-minute period. Alternatively, you can also multiply the MPH measurement by 0.868976 to convert it into its knot equivalent: Hay, William W. (2016). Experimenting on a Small Planet: A History of Scientific Discoveries, a Future of Climate Change and Global Warming (seconded.). Cham, Switzerland: Springer Verlag. p. 26. ISBN 978-3-319-27402-7. This means that you can convert MPH to knots by dividing the knot measurement by 1.15078. In other words, the MPH to knot conversion formula is as follows: