[theandrewbailey]

> A kilometer is also defined using the planet Earth as a standard of distance.

Wrong. It used to be that way, but not anymore.

[iams]

Which is why it says: ... you would have the traditional unit for the kilometer as defined in 1791 by the French Academy of Sciences.

[theandrewbailey]

Wouldn't you need the 1791 Earth, too?

The article doesn't mention that it's not the current definition.

[292355744930110]

The same can be said of the nautical mile. It is no longer defined as an minute of latitude and in instead exactly 1852 meters.