diff options
| 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/node85.html | |
| download | calfuse-d54fe7c1f704a63824c5bfa0ece65245572e9b27.tar.gz | |
Initial commit
Diffstat (limited to 'src/slalib/sun67.htx/node85.html')
| -rw-r--r-- | src/slalib/sun67.htx/node85.html | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/slalib/sun67.htx/node85.html b/src/slalib/sun67.htx/node85.html new file mode 100644 index 0000000..3c589df --- /dev/null +++ b/src/slalib/sun67.htx/node85.html @@ -0,0 +1,145 @@ +<!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_E2H - to Az,El</TITLE> +<META NAME="description" CONTENT="SLA_E2H - to Az,El"> +<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="node86.html"> +<LINK REL="previous" HREF="node84.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node86.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1276" HREF="node86.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1274" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1268" HREF="node84.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="tex2html1277" HREF="node86.html">SLA_EARTH - Approx Earth Pos/Vel</A> +<BR> +<B>Up:</B> <A NAME="tex2html1275" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1269" HREF="node84.html">SLA_DVXV - Vector Product</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION000472000000000000000"> </A><A NAME="xref_SLA_E2H"> </A><A NAME="SLA_E2H"> </A> +<BR> +SLA_E2H - <IMG WIDTH="27" HEIGHT="27" ALIGN="MIDDLE" BORDER="0" + SRC="img65.gif" + ALT="$h,\delta$"> to Az,El +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Equatorial to horizon coordinates +(single precision). +<P> <DT><STRONG>CALL:</STRONG> +<DD><TT>CALL sla_DE2H (HA, DEC, PHI, AZ, EL)</TT> +<P> </DL> +<P> <DL> +<DT><STRONG>GIVEN:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>HA</EM></TD> +<TH ALIGN="LEFT"><B>R</B></TH> +<TD ALIGN="LEFT" NOWRAP>hour angle (radians)</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DEC</EM></TD> +<TD ALIGN="LEFT"><B>R</B></TD> +<TD ALIGN="LEFT" NOWRAP>declination (radians)</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>PHI</EM></TD> +<TD ALIGN="LEFT"><B>R</B></TD> +<TD ALIGN="LEFT" NOWRAP>latitude (radians)</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>RETURNED:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>AZ</EM></TD> +<TH ALIGN="LEFT"><B>R</B></TH> +<TD ALIGN="LEFT" NOWRAP>azimuth (radians)</TD> +</TR> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EL</EM></TD> +<TD ALIGN="LEFT"><B>R</B></TD> +<TD ALIGN="LEFT" NOWRAP>elevation (radians)</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>NOTES:</STRONG> +<DD><DL COMPACT> +<DT>1. +<DD>Azimuth is returned in the range <IMG WIDTH="43" HEIGHT="25" ALIGN="MIDDLE" BORDER="0" + SRC="img66.gif" + ALT="$0\!-\!2\pi$">; north is zero, +and east is <IMG WIDTH="41" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img14.gif" + ALT="$+\pi/2$">. Elevation is returned in the range +<IMG WIDTH="25" HEIGHT="25" ALIGN="MIDDLE" BORDER="0" + SRC="img47.gif" + ALT="$\pm \pi$">. <DT>2. +<DD>The latitude must be geodetic. In critical applications, + corrections for polar motion should be applied. + <DT>3. +<DD>In some applications it will be important to specify the + correct type of hour angle and declination in order to + produce the required type of azimuth and elevation. In + particular, it may be important to distinguish between + elevation as affected by refraction, which would + require the <I>observed</I> <IMG WIDTH="41" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img29.gif" + ALT="$[\,h,\delta\,]$">, and the elevation + <I>in vacuo</I>, which would require the <I>topocentric</I> + <IMG WIDTH="41" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img29.gif" + ALT="$[\,h,\delta\,]$">. If the effects of diurnal aberration can be neglected, the + <I>apparent</I> <IMG WIDTH="41" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img29.gif" + ALT="$[\,h,\delta\,]$"> may be used instead of the topocentric + <IMG WIDTH="41" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" + SRC="img29.gif" + ALT="$[\,h,\delta\,]$">. <DT>4. +<DD>No range checking of arguments is carried out. + <DT>5. +<DD>In applications which involve many such calculations, rather + than calling the present routine it will be more efficient to + use inline code, having previously computed fixed terms such + as sine and cosine of latitude, and (for tracking a star) + sine and cosine of declination. + </DL></DL> +<BR> <HR> +<A NAME="tex2html1276" HREF="node86.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1274" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1268" HREF="node84.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="tex2html1277" HREF="node86.html">SLA_EARTH - Approx Earth Pos/Vel</A> +<BR> +<B>Up:</B> <A NAME="tex2html1275" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1269" HREF="node84.html">SLA_DVXV - Vector Product</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> |