[amsat-bb] Re: Grid Square..Physical Size??

John Franke jmfranke at cox.net
Sun Jul 1 10:29:41 PDT 2007

The area of a grid square is not uniform, it depends on your latitude.  The 
"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 degrees, 
is length of a degree of latitude and a degree of longitude equal.  The area 
of grid squares decreases as you move north or south away from the equator.


----- 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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