Speed is commonly expressed in miles per hour (mph), the distance in miles traveled in one hour. It is the standard unit for road traffic in the United States and the United Kingdom.
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Understanding Knots (kn)
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A knot (kn) is defined as one nautical mile per hour, where a nautical mile equals exactly 1852 meters (or 1.15078 statute miles). Knots are the preferred unit in maritime and aviation contexts because they relate directly to latitude/longitude and to the Earth’s geometry.
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Relationship between mph and kn
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The conversion is linear and can be expressed with a single multiplication factor:
Result: 10 mph ≈ 8.69 kn (rounded to two decimal places).
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The knot is tied to the nautical mile, which is based on the Earth’s geometry (one minute of latitude). This makes it inherently compatible with charts, GPS, and latitude/longitude calculations used in marine and aviation navigation.
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The factor is derived from the exact definitions: 1 mile = 1609.344 m and 1 nautical mile = 1852 m. Dividing the two gives 0.8689769926367107… The value is exact to the limits of double‑precision floating‑point representation, making it suitable for engineering calculations.
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"On fait la science avec des faits, comme on fait une maison avec des pierres ; mais une accumulation de faits n'est pas plus une science qu'un tas de pierres n'est une maison." "Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." — Henri Poincaré (French Mathematician, Theoretical Physicist & Mining Engineer)