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<H2><A NAME="SECTION0004157000000000000000">SLA_RVEROT - RV Corrn to Earth Centre</A>
<A NAME="xref_SLA_RVEROT"> </A><A NAME="SLA_RVEROT"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Velocity component in a given direction due to Earth rotation.
<DT><STRONG>CALL:</STRONG>
<DD><TT>R = sla_RVEROT (PHI, RA, DA, ST)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>PHI</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>geodetic latitude of observing station (radians)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RA,DA</EM></TD>
<TD ALIGN="LEFT"><B>R</B></TD>
<TD ALIGN="LEFT" NOWRAP>apparent <IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> (radians)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>ST</EM></TD>
<TD ALIGN="LEFT"><B>R</B></TD>
<TD ALIGN="LEFT" NOWRAP>local apparent sidereal time (radians)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>sla_RVEROT</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>Component of Earth rotation in
direction RA,DA (km s<SUP>-1</SUP>)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>Sign convention: the result is positive when the observatory
is receding from the given point on the sky.
<DT>2.
<DD>Accuracy: the simple algorithm used assumes a spherical Earth and
an observing station at sea level; for actual observing
sites, the error is unlikely to be greater than 0.0005 km s<SUP>-1</SUP>.
For applications requiring greater precision, use the routine
sla_PVOBS.
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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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