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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/node102.html | |
| download | calfuse-d54fe7c1f704a63824c5bfa0ece65245572e9b27.tar.gz | |
Initial commit
Diffstat (limited to 'src/slalib/sun67.htx/node102.html')
| -rw-r--r-- | src/slalib/sun67.htx/node102.html | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/slalib/sun67.htx/node102.html b/src/slalib/sun67.htx/node102.html new file mode 100644 index 0000000..d22b187 --- /dev/null +++ b/src/slalib/sun67.htx/node102.html @@ -0,0 +1,149 @@ +<!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_EVP - Earth Position & Velocity</TITLE> +<META NAME="description" CONTENT="SLA_EVP - Earth Position & Velocity"> +<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="node103.html"> +<LINK REL="previous" HREF="node101.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node103.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1446" HREF="node103.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1444" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1438" HREF="node101.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="tex2html1447" HREF="node103.html">SLA_FITXY - Fit Linear Model to Two Sets</A> +<BR> +<B>Up:</B> <A NAME="tex2html1445" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1439" HREF="node101.html">SLA_EULER - Rotation Matrix from Euler Angles</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION000489000000000000000">SLA_EVP - Earth Position & Velocity</A> +<A NAME="xref_SLA_EVP"> </A><A NAME="SLA_EVP"> </A> +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Barycentric and heliocentric velocity and position of the Earth. +<DT><STRONG>CALL:</STRONG> +<DD><TT>CALL sla_EVP (DATE, DEQX, DVB, DPB, DVH, DPH)</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 a Modified Julian Date +(JD-2400000.5)</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DEQX</EM></TD> +<TD ALIGN="LEFT"><B>D</B></TD> +<TD ALIGN="LEFT" NOWRAP>Julian Epoch (<I>e.g.</I> 2000D0) of mean equator and +equinox of the vectors returned. If DEQX <0, +all vectors are referred to the mean equator and +equinox (FK5) of date DATE.</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>RETURNED:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DVB</EM></TD> +<TH ALIGN="LEFT"><B>D(3)</B></TH> +<TD ALIGN="LEFT" NOWRAP>barycentric <IMG WIDTH="58" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img111.gif" + ALT="$[\,\dot{x},\dot{y},\dot{z}\,]$">, AU s<SUP>-1</SUP></TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DPB</EM></TD> +<TD ALIGN="LEFT"><B>D(3)</B></TD> +<TD ALIGN="LEFT" NOWRAP>barycentric <IMG WIDTH="58" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img50.gif" + ALT="$[\,x,y,z\,]$">, AU</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DVH</EM></TD> +<TD ALIGN="LEFT"><B>D(3)</B></TD> +<TD ALIGN="LEFT" NOWRAP>heliocentric <IMG WIDTH="58" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img111.gif" + ALT="$[\,\dot{x},\dot{y},\dot{z}\,]$">, AU s<SUP>-1</SUP></TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DPH</EM></TD> +<TD ALIGN="LEFT"><B>D(3)</B></TD> +<TD ALIGN="LEFT" NOWRAP>heliocentric <IMG WIDTH="58" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img50.gif" + ALT="$[\,x,y,z\,]$">, AU</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>NOTES:</STRONG> +<DD><DL COMPACT> +<DT>1. +<DD>This routine is used when accuracy is more important +than CPU time, yet the extra complication of reading a +pre-computed ephemeris is not justified. The maximum + deviations from the JPL DE96 ephemeris are as follows: + <UL> +<LI> velocity (barycentric or heliocentric): 420 mm s<SUP>-1</SUP> +<LI> position (barycentric): 6900 km +<LI> position (heliocentric): 1600 km + </UL> + <DT>2. +<DD>The routine is an adaption of the BARVEL and BARCOR + subroutines of P.Stumpff, which are described in + <I>Astr.Astrophys.Suppl.Ser.</I> <B>41</B>, 1-8 (1980). + Most of the changes are merely cosmetic and do not affect + the results at all. However, some adjustments have been + made so as to give results that refer to the new (IAU 1976 + `FK5') equinox and precession, although the differences these + changes make relative to the results from Stumpff's original + `FK4' version are smaller than the inherent accuracy of the + algorithm. One minor shortcoming in the original routines + that has <B>not</B> been corrected is that slightly better + numerical accuracy could be achieved if the various polynomial + evaluations were to be so arranged that the smallest terms were + computed first. Note also that one of Stumpff's precession + constants differs by + <IMG WIDTH="39" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" + SRC="img112.gif" + ALT="$0\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.001$"> from the value given in the + <I>Explanatory Supplement</I>. + </DL></DL> +<BR> <HR> +<A NAME="tex2html1446" HREF="node103.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1444" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1438" HREF="node101.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="tex2html1447" HREF="node103.html">SLA_FITXY - Fit Linear Model to Two Sets</A> +<BR> +<B>Up:</B> <A NAME="tex2html1445" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1439" HREF="node101.html">SLA_EULER - Rotation Matrix from Euler Angles</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> |