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NoblePlatOne

The grad, also called grade, gradian, or gon is 1/400 of a turn, so one full circle is 400 grads and a right angle is 100 grads. It is a decimal subunit of the quadrant. So, "grad/sec" means how many grads it will rotate through per second. Basically, how fast it will spin or turn.

More useless data: A kilometer was historically defined as a centi-gon of arc along a great circle of the Earth, so the kilometer is the decimal analog to the sexagesimal nautical mile. The gon is used mostly in triangulation.

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