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| author | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-03-04 21:21:30 -0500 |
|---|---|---|
| committer | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-03-04 21:21:30 -0500 |
| commit | d54fe7c1f704a63824c5bfa0ece65245572e9b27 (patch) | |
| tree | afc52015ffc2c74e0266653eecef1c8ef8ba5d91 /src/slalib/sun67.htx/node153.html | |
| download | calfuse-d54fe7c1f704a63824c5bfa0ece65245572e9b27.tar.gz | |
Initial commit
Diffstat (limited to 'src/slalib/sun67.htx/node153.html')
| -rw-r--r-- | src/slalib/sun67.htx/node153.html | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/slalib/sun67.htx/node153.html b/src/slalib/sun67.htx/node153.html new file mode 100644 index 0000000..e63959a --- /dev/null +++ b/src/slalib/sun67.htx/node153.html @@ -0,0 +1,120 @@ +<!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_PRECES - Precession</TITLE> +<META NAME="description" CONTENT="SLA_PRECES - Precession"> +<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="node154.html"> +<LINK REL="previous" HREF="node152.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node154.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1956" HREF="node154.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1954" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1948" HREF="node152.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="tex2html1957" HREF="node154.html">SLA_PRECL - Precession Matrix (latest)</A> +<BR> +<B>Up:</B> <A NAME="tex2html1955" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1949" HREF="node152.html">SLA_PREC - Precession Matrix (FK5)</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION0004140000000000000000">SLA_PRECES - Precession</A> +<A NAME="xref_SLA_PRECES"> </A><A NAME="SLA_PRECES"> </A> +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Precession - either the old ``FK4'' (Bessel-Newcomb, pre IAU 1976) +or new ``FK5'' (Fricke, post IAU 1976) as required. +<P> <DT><STRONG>CALL:</STRONG> +<DD><TT>CALL sla_PRECES (SYSTEM, EP0, EP1, RA, DC)</TT> +<P> </DL> +<P> <DL> +<DT><STRONG>GIVEN:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>SYSTEM</EM></TD> +<TH ALIGN="LEFT"><B>C</B></TH> +<TD ALIGN="LEFT" NOWRAP>precession to be applied: `FK4' or `FK5'</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EP0,EP1</EM></TD> +<TD ALIGN="LEFT"><B>D</B></TD> +<TD ALIGN="LEFT" NOWRAP>starting and ending epoch</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RA,DC</EM></TD> +<TD ALIGN="LEFT"><B>D</B></TD> +<TD ALIGN="LEFT" NOWRAP><IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img3.gif" + ALT="$[\,\alpha,\delta\,]$">, mean equator & equinox of epoch EP0</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>RETURNED:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RA,DC</EM></TD> +<TH ALIGN="LEFT"><B>D</B></TH> +<TD ALIGN="LEFT" NOWRAP><IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img3.gif" + ALT="$[\,\alpha,\delta\,]$">, mean equator & equinox of epoch EP1</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>NOTES:</STRONG> +<DD><DL COMPACT> +<DT>1. +<DD>Lowercase characters in SYSTEM are acceptable. +<DT>2. +<DD>The epochs are Besselian if SYSTEM=`FK4' and Julian if `FK5'. +For example, to precess coordinates in the old system from + equinox 1900.0 to 1950.0 the call would be: + <BLOCKQUOTE><TT>CALL sla_PRECES ('FK4', 1900D0, 1950D0, RA, DC)</TT> + </BLOCKQUOTE> + <DT>3. +<DD>This routine will <B>NOT</B> correctly convert between the old and + the new systems - for example conversion from B1950 to J2000. + For these purposes see sla_FK425, sla_FK524, sla_FK45Z and + sla_FK54Z. + <DT>4. +<DD>If an invalid SYSTEM is supplied, values of -99D0,-99D0 are + returned for both RA and DC. + </DL></DL> +<BR> <HR> +<A NAME="tex2html1956" HREF="node154.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1954" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1948" HREF="node152.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="tex2html1957" HREF="node154.html">SLA_PRECL - Precession Matrix (latest)</A> +<BR> +<B>Up:</B> <A NAME="tex2html1955" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1949" HREF="node152.html">SLA_PREC - Precession Matrix (FK5)</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> |