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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/node62.html | |
| download | calfuse-d54fe7c1f704a63824c5bfa0ece65245572e9b27.tar.gz | |
Initial commit
Diffstat (limited to 'src/slalib/sun67.htx/node62.html')
| -rw-r--r-- | src/slalib/sun67.htx/node62.html | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/slalib/sun67.htx/node62.html b/src/slalib/sun67.htx/node62.html new file mode 100644 index 0000000..dedceda --- /dev/null +++ b/src/slalib/sun67.htx/node62.html @@ -0,0 +1,154 @@ +<!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_DMOON - Approx Moon Pos/Vel</TITLE> +<META NAME="description" CONTENT="SLA_DMOON - 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="node63.html"> +<LINK REL="previous" HREF="node61.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node63.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1046" HREF="node63.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1044" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1038" HREF="node61.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="tex2html1047" HREF="node63.html">SLA_DMXM - Multiply Matrices</A> +<BR> +<B>Up:</B> <A NAME="tex2html1045" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1039" HREF="node61.html">SLA_DMAT - Solve Simultaneous Equations</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION000449000000000000000">SLA_DMOON - Approx Moon Pos/Vel</A> +<A NAME="xref_SLA_DMOON"> </A><A NAME="SLA_DMOON"> </A> +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Approximate geocentric position and velocity of the Moon +(double precision). +<P> <DT><STRONG>CALL:</STRONG> +<DD><TT>CALL sla_DMOON (DATE, PV)</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 (loosely ET) as a 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>PV</EM></TD> +<TH ALIGN="LEFT"><B>D(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>This routine is a full implementation of the algorithm +published by Meeus (see reference). +<DT>2. +<DD>Meeus quotes accuracies of <IMG WIDTH="25" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img74.gif" + ALT="$10\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> in longitude, + <IMG WIDTH="17" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img75.gif" + ALT="$3\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> in latitude and + <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img76.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.2$"> arcsec in HP + (equivalent to about 20 km in distance). Comparison with + JPL DE200 over the interval 1960-2025 gives RMS errors of +<P> <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img77.gif" + ALT="$3\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.7$"> and 83 mas/hour in longitude, +<P> <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img78.gif" + ALT="$2\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.3$"> arcsec and 48 mas/hour in latitude, + 11 km and 81 mm/s in distance. + The maximum errors over the same interval are + <IMG WIDTH="25" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img79.gif" + ALT="$18\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> and + <IMG WIDTH="31" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img80.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.50$"> /hour in longitude, + <IMG WIDTH="25" HEIGHT="17" ALIGN="BOTTOM" BORDER="0" + SRC="img43.gif" + ALT="$11\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> and + <IMG WIDTH="31" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img81.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.24$"> /hour in latitude, + 40 km and 0.29 m/s in distance. + <DT>3. +<DD>The original algorithm is expressed in terms of the obsolete + timescale <I>Ephemeris Time</I>. Either TDB or TT can be used, + but not UT without incurring significant errors (<IMG WIDTH="25" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img82.gif" + ALT="$30\hspace{-0.05em}^{'\hspace{-0.1em}'}$"> at + the present time) due to the Moon's + <IMG WIDTH="23" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img83.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.5$"> /s movement. + <DT>4. +<DD>The algorithm is based on pre IAU 1976 standards. However, + the result has been moved onto the new (FK5) equinox, an + adjustment which is in any case much smaller than the + intrinsic accuracy of the procedure. + <DT>5. +<DD>Velocity is obtained by a complete analytical differentiation + of the Meeus model. + </DL></DL> +<P> <DL> +<DT><STRONG>REFERENCE:</STRONG> +<DD>Meeus, <I>l'Astronomie</I>, June 1984, p348. +</DL> +<BR> <HR> +<A NAME="tex2html1046" HREF="node63.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1044" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1038" HREF="node61.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="tex2html1047" HREF="node63.html">SLA_DMXM - Multiply Matrices</A> +<BR> +<B>Up:</B> <A NAME="tex2html1045" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1039" HREF="node61.html">SLA_DMAT - Solve Simultaneous Equations</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> |