On Sep 16, 8:56 am, Jim Stewart wrote:
Although not quite the same, US aviation uses
a very strange hodgepodge mix of units..

Statute miles for visability
Nautical miles for navigation
Degrees Celsius for temperature
Inches of mercury for atmospheric pressure
Knots for horizontal speed
Feet per minute for vertical speed

Knots and nautical miles are based on degrees of longitude and
latitude and the size of the Earth. The Metric system was intended to
make the Earth's circumference come out to an even 40,000 Kilometers
but the surveyors made (and then covered up) mistakes.

jw