Subject: Re: [BoundaryPoint] Re: double line bug & nautical miles<br/>
Date: Nov 24, 2001 @ 05:48<br/>
Author: Anton Sherwood (Anton Sherwood &lt;bronto@...&gt;)<br/>
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<div id="ygrps-yiv-388697288"><blockquote><span title="ireply">&gt; &gt;  &gt; west of wlong 124d 05m 00s 00000  presumably nad83<br/>
<br/>
&gt; Grant Hutchison wrote:<br/>
&gt; &gt; What latitude? And are we talking west-along-that-parallel or<br/>
&gt; &gt; west-from-there-along-the-great-circle?<br/>
<br/>
 </span></blockquote><a rel="nofollow" target="_blank" href="mailto:orc@...">orc@...</a> wrote:<br/>
<blockquote><span title="ireply"> &gt; dyou mean you need to know the freakin latitude too  well of course ahem<br/>
&gt; it is n46d15m precisely to as many digits of zero as you like<br/>
<br/>
 </span></blockquote>So it&#39;s west-along-that-parallel then?<br/>
<br/>
<blockquote><span title="ireply"> &gt; &  i had thought we were absolutely talking due west here rather than<br/>
&gt; loxodrome due west if that is what you mean [...]<br/>
<br/>
 </span></blockquote>A loxodrome is a curve which always cuts the lines of longitude<br/>
at the same angle (and is therefore straight on a Mercator map).<br/>
That means a line of latitude is a loxodrome.<br/>
<br/>
Does &quot;great circle&quot; need explaining?<br/>
<br/>
<br/>
-- <br/>
Anton Sherwood  --  <a rel="nofollow" target="_blank" href="http://www.ogre.nu/">http://www.ogre.nu/</a> (online again, Nov.19)</div>