What is a knot (kt) defined as in aviation?

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A knot, abbreviated as "kt," is defined as one nautical mile per hour. This unit of measurement is crucial in aviation and maritime contexts, as it relates directly to the navigation and operation of aircraft and vessels over distances measured in nautical miles. A nautical mile is based on the circumference of the Earth, specifically, it is equal to one minute of latitude. This relationship is particularly important in navigation because it allows pilots to accurately calculate flight distances using latitude and longitude.

Using knots simplifies communication about wind speeds and aircraft speeds in a universal manner that is consistent with charts and navigation systems, which utilize nautical miles. This definition also aligns with standard practices in both the aviation and maritime fields, ensuring that all operators can communicate effectively regardless of their geographic location.

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