Ui is called knots, the set u is called knot vector, and the half-open interval [ui, ui +1) is the i-th node interval (knot span). Note that some ui may be equal and some node ranges may not exist. Video reproduced from measuring boat speed with actual knots (a chip log) It is clearly visible that the "round pieces" made of plastic are semi-circular, fixed with three ropes and brought together to one rope. After being thrown into the water, the log chips due to. 【Knot】kts = knots per hour, nautical miles/hour. It refers to the length of 1 minute of latitude on the Earth's meridian. Since the Earth is slightly ellipsoid-shaped, the arc of 1 minute at different latitudes is slightly different.
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[Example] they travel at speeds of up to 30.