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<H2><A NAME="SECTION0004101000000000000000">SLA_GEOC - Geodetic to Geocentric</A>
<A NAME="xref_SLA_GEOC"> </A><A NAME="SLA_GEOC"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Convert geodetic position to geocentric.
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_GEOC (P, H, R, Z)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>P</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>latitude (geodetic, radians)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>H</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>height above reference spheroid (geodetic, metres)</TD>
</TR>
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<DT><STRONG>RETURNED:</STRONG>
<DD>
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<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>R</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>distance from Earth axis (AU)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>Z</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>distance from plane of Earth equator (AU)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>Geocentric latitude can be obtained by evaluating <TT>ATAN2(Z,R)</TT>.
<DT>2.
<DD>IAU 1976 constants are used.
</DL></DL>
<P> <DL>
<DT><STRONG>REFERENCE:</STRONG>
<DD>Green, R.M., 1985. <I>Spherical Astronomy</I>, Cambridge U.P., p98.
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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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