diff options
Diffstat (limited to 'src/slalib/sun67.htx/node130.html')
| -rw-r--r-- | src/slalib/sun67.htx/node130.html | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/slalib/sun67.htx/node130.html b/src/slalib/sun67.htx/node130.html new file mode 100644 index 0000000..99d6086 --- /dev/null +++ b/src/slalib/sun67.htx/node130.html @@ -0,0 +1,140 @@ +<!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_MOON - Approx Moon Pos/Vel</TITLE> +<META NAME="description" CONTENT="SLA_MOON - Approx Moon Pos/Vel"> +<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="node131.html"> +<LINK REL="previous" HREF="node129.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node131.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1726" HREF="node131.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1724" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1718" HREF="node129.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="tex2html1727" HREF="node131.html">SLA_MXM - Multiply Matrices</A> +<BR> +<B>Up:</B> <A NAME="tex2html1725" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1719" HREF="node129.html">SLA_MAPQKZ - Quick Mean-Appt, no PM etc.</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION0004117000000000000000">SLA_MOON - Approx Moon Pos/Vel</A> +<A NAME="xref_SLA_MOON"> </A><A NAME="SLA_MOON"> </A> +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Approximate geocentric position and velocity of the Moon +(single precision). +<P> <DT><STRONG>CALL:</STRONG> +<DD><TT>CALL sla_MOON (IY, ID, FD, PV)</TT> +<P> </DL> +<P> <DL> +<DT><STRONG>GIVEN:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>IY</EM></TD> +<TH ALIGN="LEFT"><B>I</B></TH> +<TD ALIGN="LEFT" NOWRAP>year</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>ID</EM></TD> +<TD ALIGN="LEFT"><B>I</B></TD> +<TD ALIGN="LEFT" NOWRAP>day in year (1 = Jan 1st)</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>FD</EM></TD> +<TD ALIGN="LEFT"><B>R </B></TD> +<TD ALIGN="LEFT" NOWRAP>fraction of day</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>RETURNED:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>PV</EM></TD> +<TH ALIGN="LEFT"><B>R(6)</B></TH> +<TD ALIGN="LEFT" NOWRAP>Moon <IMG WIDTH="106" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img51.gif" + ALT="$[\,x,y,z,\dot{x},\dot{y},\dot{z}\,]$">, mean equator and equinox of +date (AU, AU s<SUP>-1</SUP>)</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>NOTES:</STRONG> +<DD><DL COMPACT> +<DT>1. +<DD>The date and time is TDB (loosely ET) in a Julian calendar +which has been aligned to the ordinary Gregorian +calendar for the interval 1900 March 1 to 2100 February 28. + The year and day can be obtained by calling sla_CALYD or + sla_CLYD. + <DT>2. +<DD>The position is accurate to better than 0.5 arcminute + in direction and 1000 km in distance. The velocity + is accurate to better than + <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img83.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.5$"> per hour in direction + and 4 metres per socond in distance. (RMS figures with respect + to JPL DE200 for the interval 1960-2025 are <IMG WIDTH="25" HEIGHT="17" ALIGN="BOTTOM" BORDER="0" + SRC="img126.gif" + ALT="$14\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> and +<P> <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img76.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.2$"> per hour in longitude, <IMG WIDTH="17" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img127.gif" + ALT="$9\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> and + <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img76.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.2$"><P> +per hour in latitude, 350 km and 2 metres per second in distance.) + Note that the distance accuracy is comparatively poor because this + routine is principally intended for computing topocentric direction. + <DT>3. +<DD>This routine is only a partial implementation of the original + Meeus algorithm (reference below), which offers 4 times the + accuracy in direction and 20 times the accuracy in distance + when fully implemented (as it is in sla_DMOON). + </DL></DL> +<P> <DL> +<DT><STRONG>REFERENCE:</STRONG> +<DD>Meeus, <I>l'Astronomie</I>, June 1984, p348. +</DL> +<BR> <HR> +<A NAME="tex2html1726" HREF="node131.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1724" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1718" HREF="node129.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="tex2html1727" HREF="node131.html">SLA_MXM - Multiply Matrices</A> +<BR> +<B>Up:</B> <A NAME="tex2html1725" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1719" HREF="node129.html">SLA_MAPQKZ - Quick Mean-Appt, no PM etc.</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> |