knot

Name	Symbol	Quantity	SI units
knot	kn	speed	¹⁸⁵²⁄₃₆₀₀ m s^-1
The knot, symbol kn, is a non-SI unit of speed. The knot is not accepted for use with the SI. One knot is equal to one nautical mile per hour, or ¹⁸⁵²⁄₃₆₀₀ m s⁻¹
Definition			c
$1 \mspace{4mu} \text{kn} \mspace{6mu} = \dfrac{1 \mspace{4mu} 852}{(3 \mspace{4mu} 600)(299 \mspace{4mu} 792 \mspace{4mu} 458)} \mspace{6mu} c\\ \\ \\ 1 \mspace{4mu} \text{kn} \mspace{6mu} \approx 1.716 \mspace{4mu} 001 \mspace{4mu} 956 \mspace{4mu} 408 \mspace{4mu} 271 \mspace{4mu} 099 \mspace{4mu} 483 \times10^{-9} \mspace{6mu} c$