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diff --git a/src/slalib/sun67.htx/node154.html b/src/slalib/sun67.htx/node154.html new file mode 100644 index 0000000..a20e26a --- /dev/null +++ b/src/slalib/sun67.htx/node154.html @@ -0,0 +1,131 @@ +<!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 --> +<HTML> +<HEAD> +<TITLE>SLA_PRECL - Precession Matrix (latest)</TITLE> +<META NAME="description" CONTENT="SLA_PRECL - Precession Matrix (latest)"> +<META NAME="keywords" CONTENT="sun67"> +<META NAME="resource-type" CONTENT="document"> +<META NAME="distribution" CONTENT="global"> +<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso_8859_1"> +<LINK REL="STYLESHEET" HREF="sun67.css"> +<LINK REL="next" HREF="node155.html"> +<LINK REL="previous" HREF="node153.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node155.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1966" HREF="node155.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1964" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1958" HREF="node153.html"> +<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="previous_motif.gif"></A> <A HREF="sun67.html#stardoccontents"><IMG ALIGN="BOTTOM" BORDER="0" + SRC="contents_motif.gif"></A> +<BR> +<B> Next:</B> <A NAME="tex2html1967" HREF="node155.html">SLA_PRENUT - Precession/Nutation Matrix</A> +<BR> +<B>Up:</B> <A NAME="tex2html1965" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1959" HREF="node153.html">SLA_PRECES - Precession</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION0004141000000000000000">SLA_PRECL - Precession Matrix (latest)</A> +<A NAME="xref_SLA_PRECL"> </A><A NAME="SLA_PRECL"> </A> +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Form the matrix of precession between two epochs, using the +model of Simon <I>et al</I>. (1994), which is suitable for long + periods of time. +<P> <DT><STRONG>CALL:</STRONG> +<DD><TT>CALL sla_PRECL (EP0, EP1, RMATP)</TT> +<P> </DL> +<P> <DL> +<DT><STRONG>GIVEN:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EP0</EM></TD> +<TH ALIGN="LEFT"><B>D</B></TH> +<TD ALIGN="LEFT" NOWRAP>beginning epoch</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EP1</EM></TD> +<TD ALIGN="LEFT"><B>D</B></TD> +<TD ALIGN="LEFT" NOWRAP>ending epoch</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>RETURNED:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RMATP</EM></TD> +<TH ALIGN="LEFT"><B>D(3,3)</B></TH> +<TD ALIGN="LEFT" NOWRAP>precession matrix</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>NOTES:</STRONG> +<DD><DL COMPACT> +<DT>1. +<DD>The epochs are TDB Julian epochs. +<DT>2. +<DD>The matrix is in the sense: +<BLOCKQUOTE><B>v</B><SUB>1</SUB> = <B>M</B><IMG WIDTH="7" HEIGHT="14" ALIGN="BOTTOM" BORDER="0" + SRC="img72.gif" + ALT="$\cdot$"><B>v</B><SUB>0</SUB></BLOCKQUOTE> + where <B>v</B><SUB>1</SUB> is the star vector relative to the + mean equator and equinox of epoch EP1, <B>M</B> is the + <IMG WIDTH="39" HEIGHT="25" ALIGN="MIDDLE" BORDER="0" + SRC="img18.gif" + ALT="$3\times3$"> matrix RMATP and + <B>v</B><SUB>0</SUB> is the star vector relative to the + mean equator and equinox of epoch EP0. + <DT>3. +<DD>The absolute accuracy of the model is limited by the + uncertainty in the general precession, about + <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img32.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.3$"> per + 1000 years. The remainder of the formulation provides a + precision of 1 milliarcsecond over the interval from 1000AD + to 3000AD, + <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img25.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.1$"> from 1000BC to 5000AD and + <IMG WIDTH="17" HEIGHT="17" ALIGN="BOTTOM" BORDER="0" + SRC="img140.gif" + ALT="$1\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> from 4000BC to 8000AD. + </DL></DL> +<P> <DL> +<DT><STRONG>REFERENCE:</STRONG> +<DD>Simon, J.L. <I>et al</I>., 1994. <I>Astr.Astrophys.</I> <B>282</B>, +663. + </DL> +<BR> <HR> +<A NAME="tex2html1966" HREF="node155.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1964" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1958" HREF="node153.html"> +<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="previous_motif.gif"></A> <A HREF="sun67.html#stardoccontents"><IMG ALIGN="BOTTOM" BORDER="0" + SRC="contents_motif.gif"></A> +<BR> +<B> Next:</B> <A NAME="tex2html1967" HREF="node155.html">SLA_PRENUT - Precession/Nutation Matrix</A> +<BR> +<B>Up:</B> <A NAME="tex2html1965" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1959" HREF="node153.html">SLA_PRECES - Precession</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<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> +</ADDRESS> +</BODY> +</HTML> |