Re: Talking of old jokes
- From: Doug Wickstrom <nimshubur@xxxxxxxxxxx>
- Date: Sun, 02 Jul 2006 13:39:02 -0500
On 2 Jul 2006 10:04:43 -0700, "mike weber"
Wilson Heydt wrote:
In article <e86jv2$2u4$1@xxxxxxxxxxxxxxxx>,
Keith F. Lynch <kfl@xxxxxxxxxxxxxx> wrote:
Wilson Heydt <whheydt@xxxxxxxxxxx> wrote:
One minute of arc is damned sloppy sextant work. They're accurate
to 6 seconds of arc. A good navigator (using sextant, mechanical
clock, and ephemeris) can get a position at sea to within 1 nautical
One nautical mile *is* (at least) one minute of arc.
At 45 degrees latittude.
Nope -- at the equator [or any other Great Circle] (damned close,
Sea mile = 6000 feet, statute mile = 5280 feet.
Circumference of Earth: 24900 statute miles = 21912 sea miles
Divided by 21600 minutes of arc = 1.014 nautical miles.
Error of 86 feet.
Admiralty Mile (the UK nautical mile until 1970): 6080 feet.
US nautical mile (until 1954): 6080.2 feet.
International nautical mile, as agreed by treaty in 1929, and
since adopted by all nations: 1852 meters, or 6076.1155 feet.
- Prev by Date: Re: Talking of old jokes
- Next by Date: Re: Translating from the American
- Previous by thread: Re: Talking of old jokes
- Next by thread: Re: Talking of old jokes