
Originally Posted by
ramblingboy42
Why do the worlds navies still use knots to measure speed? tradition?
it fits perfectly into the nautical mile and also into space-time continuum....which no one knew about when they decided to use knots.
it , and the nautical mile also fit mathematically beautifully into speed of light and interplanetary and universal distance calculations, which the mile and kilometre do not , but again they didn't know that.
I think I remember Dr Karl talking about this on aunty one morning.....
Because the earth is basicially a sphere so with 360 degrees around the equator - and north south lines of longitude and great circles - so putting aside the slight bulges in the earth etc - all lines of longitude and the equator 0 latitude have the same anglular distance - 360 degrees - each degree is then broken down to minutes - 60 to the degree - so 1 minute of arc is 1nm making 1 degree of arc 60nm.
So all based on the standard diameter of the earth - so if you travel 60 nm (or an angular distance of 1 degree) in one hour you are doing 60 knots, while there are slight errors due to bulges etc, it is close enough for government work.
Clear as mud but straight forward for the nautical and aeronautical types.
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
Bookmarks