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distanceTo computes the approximate distance in kilometres between two notes for which a $Latitude and $Longitude are known.

For example, if note1 'Boston' has the latitude and longitude of Boston and note2 'Paris' has the latitude a longitude of Paris, then for

$MyNumber = distanceTo("Boston","Paris"); 

$MyNumber is about 5582 (km).

Long distances should use a great circle route.

Note the measurement is approximate and not intended for precise navigation.