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authorJoseph Hunkeler <jhunkeler@gmail.com>2015-03-04 21:21:30 -0500
committerJoseph Hunkeler <jhunkeler@gmail.com>2015-03-04 21:21:30 -0500
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
+<!--Converted with LaTeX2HTML 97.1 (release) (July 13th, 1997)
+ by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds
+* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
+* with significant contributions from:
+ Jens Lippman, Marek Rouchal, Martin Wilck and others -->
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+<HEAD>
+<TITLE>SLA_DSEP - Angle Between 2 Points on Sphere</TITLE>
+<META NAME="description" CONTENT="SLA_DSEP - Angle Between 2 Points on Sphere">
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+<LINK REL="previous" HREF="node71.html">
+<LINK REL="up" HREF="node13.html">
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+<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A>
+<A NAME="tex2html1144" HREF="node13.html">
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+<A NAME="tex2html1138" HREF="node71.html">
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+ SRC="contents_motif.gif"></A>
+<BR>
+<B> Next:</B> <A NAME="tex2html1147" HREF="node73.html">SLA_DT - Approximate ET minus UT</A>
+<BR>
+<B>Up:</B> <A NAME="tex2html1145" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A>
+<BR>
+<B> Previous:</B> <A NAME="tex2html1139" HREF="node71.html">SLA_DS2TP - Spherical to Tangent Plane</A>
+<BR> <HR> <P>
+<P><!--End of Navigation Panel-->
+<H2><A NAME="SECTION000459000000000000000">SLA_DSEP - Angle Between 2 Points on Sphere</A>
+<A NAME="xref_SLA_DSEP">&#160;</A><A NAME="SLA_DSEP">&#160;</A>
+</H2>
+ <DL>
+<DT><STRONG>ACTION:</STRONG>
+<DD>Angle between two points on a sphere (double precision).
+<DT><STRONG>CALL:</STRONG>
+<DD><TT>D&nbsp;=&nbsp;sla_DSEP (A1, B1, A2, B2)</TT>
+<P> </DL>
+<P> <DL>
+<DT><STRONG>GIVEN:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>A1,B1</EM></TD>
+<TH ALIGN="LEFT"><B>D</B></TH>
+<TD ALIGN="LEFT" NOWRAP>spherical coordinates of one point (radians)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>A2,B2</EM></TD>
+<TD ALIGN="LEFT"><B>D</B></TD>
+<TD ALIGN="LEFT" NOWRAP>spherical coordinates of the other point (radians)</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>RETURNED:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>sla_DSEP</EM></TD>
+<TH ALIGN="LEFT"><B>D</B></TH>
+<TD ALIGN="LEFT" NOWRAP>angle between [A1,B1] and [A2,B2] in radians</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>NOTES:</STRONG>
+<DD><DL COMPACT>
+<DT>1.
+<DD>The spherical coordinates are right ascension and declination,
+longitude and latitude, <I>etc.</I>, in radians.
+<DT>2.
+<DD>The result is always positive.
+ </DL></DL>
+<BR> <HR>
+<A NAME="tex2html1146" HREF="node73.html">
+<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A>
+<A NAME="tex2html1144" HREF="node13.html">
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+<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="previous_motif.gif"></A> <A HREF="sun67.html#stardoccontents"><IMG ALIGN="BOTTOM" BORDER="0"
+ SRC="contents_motif.gif"></A>
+<BR>
+<B> Next:</B> <A NAME="tex2html1147" HREF="node73.html">SLA_DT - Approximate ET minus UT</A>
+<BR>
+<B>Up:</B> <A NAME="tex2html1145" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A>
+<BR>
+<B> Previous:</B> <A NAME="tex2html1139" HREF="node71.html">SLA_DS2TP - Spherical to Tangent Plane</A>
+<BR> <HR> <P>
+<P><!--End of Navigation Panel-->
+<ADDRESS>
+<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
+</ADDRESS>
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