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<H2><A NAME="SECTION000417000000000000000">SLA_CC2S - Cartesian to Spherical</A>
<A NAME="xref_SLA_CC2S"> </A><A NAME="SLA_CC2S"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Cartesian coordinates to spherical coordinates (single precision).
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_CC2S (V, A, B)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>V</EM></TD>
<TH ALIGN="LEFT"><B>R(3)</B></TH>
<TD ALIGN="LEFT" NOWRAP><IMG WIDTH="58" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img50.gif"
ALT="$[\,x,y,z\,]$"> vector</TD>
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<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>A,B</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>spherical coordinates in radians</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>The spherical coordinates are longitude (+ve anticlockwise
looking from the +ve latitude pole) and latitude. The
Cartesian coordinates are right handed, with the <I>x</I>-axis
at zero longitude and latitude, and the <I>z</I>-axis at the
+ve latitude pole.
<DT>2.
<DD>If V is null, zero A and B are returned.
<DT>3.
<DD>At either pole, zero A is returned.
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<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>
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