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by gfv
1367 days ago
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They are used indirectly through distance. At the time, the meter was defined as one ten millionth of the distance between the north pole and equator through the Paris meridian. That means that the meter corresponds to 1/100000 of a grad of latitude -- which is better read as "a kilometre is 1/100 of a grad". This is symmetrical to the nautical mile, which is one minute of arc. |
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