2018-10-11 12:09:19 UTC
A nautical mile is a unit of measurement defined as exactly 1,852 metres.
Historically, it was defined as one minute of latitude, which is equivalent
to one sixtieth of a degree of latitude.
From lefty wiki even....
"Clare Snyder" <***@snyder.on.ca> wrote in message news:***@4ax.com...
: On Wed, 10 Oct 2018 23:41:03 -0400, micky <***@bigfoot.com>
: >This is from Wikip's article on Gemini 8:
: >Perigee (min): 159.8 kilometers (86.3 nautical miles)
: >Why are there nautical miles but no nautical kilometers?
: Why shouldthere be? A naughtical mile is equivalent to 1 degree of
: latitude. A statute mile is an arbitrary measurement.
: The origins of the meter go back to at least the 18th century. At that
: time, there were two competing approaches to the definition of a
: standard unit of length. Some suggested defining the meter as the
: length of a pendulum having a half-period of one second; others
: suggested defining the meter as one ten-millionth of the length of the
: earth's meridian along a quadrant (one fourth the circumference of the
: earth). In 1791, soon after the French Revolution, the French Academy
: of Sciences chose the meridian definition over the pendulum definition
: because the force of gravity varies slightly over the surface of the
: earth, affecting the period of the pendulum.
: Why add another arbitrary measurement to the mix????