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<H2><A NAME="SECTION0004142000000000000000">SLA_PRENUT - Precession/Nutation Matrix</A>
<A NAME="xref_SLA_PRENUT"> </A><A NAME="SLA_PRENUT"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Form the matrix of precession and nutation (IAU 1976, FK5).
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_PRENUT (EPOCH, DATE, RMATPN)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EPOCH</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>Julian Epoch for mean coordinates</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DATE</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>Modified Julian Date (JD-2400000.5)
for true coordinates</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RMATPN</EM></TD>
<TH ALIGN="LEFT"><B>D(3,3)</B></TH>
<TD ALIGN="LEFT" NOWRAP>combined precession/nutation matrix</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>The epoch and date are TDB.
<DT>2.
<DD>The matrix is in the sense:
<BLOCKQUOTE><B>v</B><SUB><I>true</I></SUB> = <B>M</B><IMG WIDTH="7" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img72.gif"
ALT="$\cdot$"><B>v</B><SUB><I>mean</I></SUB></BLOCKQUOTE>
where <B>v</B><SUB><I>true</I></SUB> is the star vector relative to the
true equator and equinox of epoch DATE, <B>M</B> is the
<IMG WIDTH="39" HEIGHT="25" ALIGN="MIDDLE" BORDER="0"
SRC="img18.gif"
ALT="$3\times3$"> matrix RMATPN and
<B>v</B><SUB><I>mean</I></SUB> is the star vector relative to the
mean equator and equinox of epoch EPOCH.
</DL></DL>
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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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