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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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+<TITLE>SLA_ECMAT - Form Matrix</TITLE>
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+<H2><A NAME="SECTION000475000000000000000">&#160;</A><A NAME="xref_SLA_ECMAT">&#160;</A><A NAME="SLA_ECMAT">&#160;</A>
+<BR>
+SLA_ECMAT - Form <IMG WIDTH="81" HEIGHT="27" ALIGN="MIDDLE" BORDER="0"
+ SRC="img95.gif"
+ ALT="$\alpha,\delta\rightarrow\lambda,\beta$"> Matrix
+</H2>
+ <DL>
+<DT><STRONG>ACTION:</STRONG>
+<DD>Form the equatorial to ecliptic rotation matrix (IAU 1980 theory).
+<DT><STRONG>CALL:</STRONG>
+<DD><TT>CALL sla_ECMAT (DATE, RMAT)</TT>
+<P> </DL>
+<P> <DL>
+<DT><STRONG>GIVEN:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DATE</EM></TD>
+<TH ALIGN="LEFT"><B>D</B></TH>
+<TD ALIGN="LEFT" NOWRAP>TDB (formerly ET) as Modified Julian Date
+(JD-2400000.5)</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>RETURNED:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RMAT</EM></TD>
+<TH ALIGN="LEFT"><B>D(3,3)</B></TH>
+<TD ALIGN="LEFT" NOWRAP>rotation matrix</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>NOTES:</STRONG>
+<DD><DL COMPACT>
+<DT>1.
+<DD>RMAT is matrix <B>M</B> in the expression
+<B>v</B><SUB><I>ecl</I></SUB>&nbsp;=&nbsp;<B>M</B><IMG WIDTH="7" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
+ SRC="img72.gif"
+ ALT="$\cdot$"><B>v</B><SUB><I>equ</I></SUB>.
+<DT>2.
+<DD>The equator, equinox and ecliptic are mean of date.
+ </DL></DL>
+<P> <DL>
+<DT><STRONG>REFERENCE:</STRONG>
+<DD>Murray, C.A., <I>Vectorial Astrometry</I>, section 4.3.
+</DL>
+<BR> <HR>
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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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