NavList:

Dan wrote:

> With today's measurements it turns out to be off by a very
> small amount,

Would that error be due to the assumption at the time that the Earth was a
perfect sphere, something that we know today isn't really the case?

--
GregR


----- Original Message -----
From: "Dan Allen" <danallen46@airwired.net>
To: <NavList@fer3.com>
Sent: Monday, July 17, 2006 11:00 AM
Subject: [NavList 772] Re: Units and area.


>
>
> On 17 Jul 2006, at 11:13 AM, Philip Lange wrote:
>
> > Of course the system of Nautical Miles, Cables and Fathoms does
> > have a bit of logic going for it.
>
> The nautical mile is based on the distance from the equator to the
> pole.  With today's measurements it turns out to be off by a very
> small amount, but this is still a very useful rule of thumb: one
> degree of latitude is 60 nautical miles.  Very handy.
>
> Dan
>
>
> >
>



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