diff options
Diffstat (limited to 'src/slalib/sun67.htx/node80.html')
| -rw-r--r-- | src/slalib/sun67.htx/node80.html | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/slalib/sun67.htx/node80.html b/src/slalib/sun67.htx/node80.html new file mode 100644 index 0000000..e7704f5 --- /dev/null +++ b/src/slalib/sun67.htx/node80.html @@ -0,0 +1,111 @@ +<!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_DTT - TT minus UTC</TITLE> +<META NAME="description" CONTENT="SLA_DTT - TT minus UTC"> +<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="node81.html"> +<LINK REL="previous" HREF="node79.html"> +<LINK REL="up" HREF="node13.html"> +<LINK REL="next" HREF="node81.html"> +</HEAD> +<BODY > +<BR> <HR> +<A NAME="tex2html1226" HREF="node81.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1224" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1218" HREF="node79.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="tex2html1227" HREF="node81.html">SLA_DV2TP - Direction Cosines to Tangent Plane</A> +<BR> +<B>Up:</B> <A NAME="tex2html1225" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1219" HREF="node79.html">SLA_DTPV2C - Plate centre from and x,y,z</A> +<BR> <HR> <P> +<P><!--End of Navigation Panel--> +<H2><A NAME="SECTION000467000000000000000">SLA_DTT - TT minus UTC</A> +<A NAME="xref_SLA_DTT"> </A><A NAME="SLA_DTT"> </A> +</H2> + <DL> +<DT><STRONG>ACTION:</STRONG> +<DD>Compute <IMG WIDTH="16" HEIGHT="13" ALIGN="BOTTOM" BORDER="0" + SRC="img19.gif" + ALT="$\Delta$">TT, the increment to be applied to +Coordinated Universal Time UTC to give + Terrestrial Time TT. +<P> <DT><STRONG>CALL:</STRONG> +<DD><TT>D = sla_DTT (DJU)</TT> +<P> </DL> +<P> <DL> +<DT><STRONG>GIVEN:</STRONG> +<DD> +<BR> +<TABLE CELLPADDING=3> +<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>DJU</EM></TD> +<TH ALIGN="LEFT"><B>D</B></TH> +<TD ALIGN="LEFT" NOWRAP>UTC date as a modified JD (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>sla_DTT</EM></TD> +<TH ALIGN="LEFT"><B>D</B></TH> +<TD ALIGN="LEFT" NOWRAP>TT-UTC in seconds</TD> +</TR> +</TABLE></DL> +<P> <DL> +<DT><STRONG>NOTES:</STRONG> +<DD><DL COMPACT> +<DT>1. +<DD>The UTC is specified to be a date rather than a time to indicate +that care needs to be taken not to specify an instant which lies +within a leap second. Though in most cases UTC can include the + fractional part, correct behaviour on the day of a leap second + can be guaranteed only up to the end of the second + <IMG WIDTH="82" HEIGHT="17" ALIGN="BOTTOM" BORDER="0" + SRC="img54.gif" + ALT="$23^{\rm h}\,59^{\rm m}\,59^{\rm s}$">. <DT>2. +<DD>Pre 1972 January 1 a fixed value of 10 + ET-TAI is returned. + <DT>3. +<DD>TT is one interpretation of the defunct timescale + <I>Ephemeris Time</I>, ET. + <DT>4. +<DD>See also the routine sla_DT, which roughly estimates ET-UT for + historical epochs. + </DL></DL> +<BR> <HR> +<A NAME="tex2html1226" HREF="node81.html"> +<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A> +<A NAME="tex2html1224" HREF="node13.html"> +<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A> +<A NAME="tex2html1218" HREF="node79.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="tex2html1227" HREF="node81.html">SLA_DV2TP - Direction Cosines to Tangent Plane</A> +<BR> +<B>Up:</B> <A NAME="tex2html1225" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A> +<BR> +<B> Previous:</B> <A NAME="tex2html1219" HREF="node79.html">SLA_DTPV2C - Plate centre from and x,y,z</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> |