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June 22, 2013 8:51 am
Why are distances at sea measured in knots? In the 1500s, sailors would drop a chip log off the side of the boat and let out the rope for about thirty seconds, counting how many knots on the rope went out. Eventually, one knot came to mean one nautical mile per hour. Incidentally, this same log gave us logbook, weblog, and ultimately, blog. This is part of a complete episode.