|
|
|
|
|
|
by fanf2
3605 days ago
|
|
|
Grads are part of how the metric system was constructed: the metre was originally 1/10000 the distance from the North Pole to the equator via Paris, so 1 grad of arc on a great circle is 100km. Compare the nautical mile which is 1 minute of arc. |
|
|