X-Git-Url: http://gb7djk.dxcluster.net/gitweb/gitweb.cgi?a=blobdiff_plain;f=perl%2FDXBearing.pm;h=db6f4686d0a75ed89c32e0c32e28509ae233bb5a;hb=8106275008346b0cceb090f7317ff4240a3ba44f;hp=b98d746a5b5c88d4e2df409068ad43dd312aae2b;hpb=e2ca7811e49048bfad82ec31e148a79fe9904e2b;p=spider.git

diff --git a/perl/DXBearing.pm b/perl/DXBearing.pm
index b98d746a..db6f4686 100644
--- a/perl/DXBearing.pm
+++ b/perl/DXBearing.pm
@@ -101,6 +101,20 @@ sub bdist
 	return (rd($az), $dx);
 }
 
+# just the distance - parameters as above
+sub distance
+{
+	my $hn = dr(shift);
+	my $he = dr(shift);
+	my $n = dr(shift);
+	my $e = dr(shift);
+	return (0, 0) if $hn == $n && $he == $e;
+	my $co = cos($he-$e)*cos($hn)*cos($n)+sin($hn)*sin($n);
+	my $ca = $co ? atan(abs(sqrt(1-$co*$co)/$co)) : $pi;
+	$ca = $pi-$ca if $co < 0;
+	my $dx = 6367*$ca;
+}
+
 # turn a lat long string into floating point lat and long
 sub stoll
 {