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<H2><A NAME="SECTION000475000000000000000"> </A><A NAME="xref_SLA_ECMAT"> </A><A NAME="SLA_ECMAT"> </A>
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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>
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<DT><STRONG>RETURNED:</STRONG>
<DD>
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<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> = <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>
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<DT><STRONG>REFERENCE:</STRONG>
<DD>Murray, C.A., <I>Vectorial Astrometry</I>, section 4.3.
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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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