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<H2><A NAME="SECTION000476000000000000000">SLA_ECOR - RV & Time Corrns to Sun</A>
<A NAME="xref_SLA_ECOR"> </A><A NAME="SLA_ECOR"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Component of Earth orbit velocity and heliocentric
light time in a given direction.
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_ECOR (RM, DM, IY, ID, FD, RV, TL)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RM,DM</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>mean <IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> of date (radians)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>IY</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<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>RV</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>component of Earth orbital velocity (km s<SUP>-1</SUP>)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>TL</EM></TD>
<TD ALIGN="LEFT"><B>R</B></TD>
<TD ALIGN="LEFT" NOWRAP>component of heliocentric light time (s)</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>Sign convention:
<UL>
<LI> The velocity component is +ve when the
Earth is receding from
the given point on the sky.
<LI> The light time component is +ve
when the Earth lies between the Sun and
the given point on the sky.
</UL>
<DT>3.
<DD>Accuracy:
<UL>
<LI> The velocity component is usually within 0.004 km s<SUP>-1</SUP>
of the correct value and is never in error by more than
0.007 km s<SUP>-1</SUP>.
<LI> The error in light time correction is about
<IMG WIDTH="32" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img96.gif"
ALT="$0^{\rm s}\hspace{-0.3em}.03$"> at worst,
but is usually better than <IMG WIDTH="32" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img97.gif"
ALT="$0^{\rm s}\hspace{-0.3em}.01$">. </UL>
For applications requiring higher accuracy, see the sla_EVP routine.
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<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>
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