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In ballistics and gunnery we use milsWhich is almost a milli radian but not quite - 6400 in a full circle!
1 knot = 1 nautical mile
I noticed a disturbing trend amongst my younger scientific colleagues to refer to millimetres as mils, thus providing scope for even more confusion with our transatlantic friends who refer to thous as mils - not that the youngsters have any idea what a thou is. It all makes life interesting Rod
To say nothing of "tenths"...( 1 "tenth" = 1/10000") which is bantered around all the time....on this side of the pond...amongst Engineers and Machinists....it's a lock.....beyond that, over here anyway......glazed looks only...
Want to try that one again, Bob? A knot is one nautical mile per hour, a unit of speed, not distance. With a naval background, I know you know that but let's not confuse the landlubbers.Bob has pointed out the annoying fact that the length of a minute of longitude decreases as one approaches the poles. However, the 1 arcmin = 1 nautical mile approximation remains valid on any great circle route (a circle whose plane passes through the center of the earth). Since great circles are the shortest distance between two points on earth they're frequently the path sailed by ships. As such the approximation is very useful.
What about the numerous folks on this and other fora who refer to 0.001" as "thousands" rather than thousandths? [Which they then measure with their "guages".]
Quote from: mklotz on August 05, 2013, 05:05:43 PMWant to try that one again, Bob? A knot is one nautical mile per hour, a unit of speed, not distance. With a naval background, I know you know that but let's not confuse the landlubbers.Bob has pointed out the annoying fact that the length of a minute of longitude decreases as one approaches the poles. However, the 1 arcmin = 1 nautical mile approximation remains valid on any great circle route (a circle whose plane passes through the center of the earth). Since great circles are the shortest distance between two points on earth they're frequently the path sailed by ships. As such the approximation is very useful.Don´t knots predate clocks? Something about trailing a knotted line with a piece of wood (a log?) and counting knots while the sand runs out.AlanThanks for the correction Marv.Great Circle routes are only contemplated when the distance to be traveled >1500NM and there is nothing in the way such as reefs, islands and the like. I would think they are ideal for long distance air travel.Best RegardsBob
Quote from: mklotz on August 05, 2013, 05:29:45 PMWhat about the numerous folks on this and other fora who refer to 0.001" as "thousands" rather than thousandths? [Which they then measure with their "guages".]Marv, they are afraid people will think they lisp.