[amsat-bb] Re: Grid Square..Physical Size??
kc6uqh at cox.net
Sun Jul 1 15:06:35 PDT 2007
Good to hear from someone that knows navigation "Minute is a Mile", a 6000
foot Nautical mile making a second 100 feet in latitude.
One other caviat, At the equator a "Grid Square" is a 2 degree longitude by
one degree latitude rectangle and is most square at 60 degrees North or
South Latitude ( COS 60 degrees = 0.5).
----- Original Message -----
From: "John Franke" <jmfranke at cox.net>
To: <amsat-bb at amsat.org>; "Frank A Cahoy" <k0blt at juno.com>
Sent: Sunday, July 01, 2007 10:29 AM
Subject: [amsat-bb] Re: Grid Square..Physical Size??
> The area of a grid square is not uniform, it depends on your latitude.
> "height" of a square formed by latitude and longitude lines is simply the
> difference in latitude, in degrees times 60 nautical miles. However the
> length of a segment of a latitude line between to longitudes in nautical
> miles is approximately the difference in longitudes times 60 times the
> cosine of the latitude. Only at the equator, latitude equals zero
> is length of a degree of latitude and a degree of longitude equal. The
> of grid squares decreases as you move north or south away from the
> John WA4WDL
> ----- Original Message -----
> From: "Frank A Cahoy" <k0blt at juno.com>
> To: <amsat-bb at amsat.org>
> Sent: Sunday, July 01, 2007 12:07 PM
> Subject: [amsat-bb] Grid Square..Physical Size??
>> Hello All,
>> A friend and I were discussing the actual physical size of a grid square
>> in kilometers and or miles and we cannot come up with anything positive.
>> Can anyone reading this provide us with those actual numbers?
>> No real argument involved. Just a matter of curiosity.....
>> Thank you in advance...
>> 73 Frank, K0BLT
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