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<H2><A NAME="SECTION0004111000000000000000">SLA_KBJ - Select Epoch Prefix</A>
<A NAME="xref_SLA_KBJ"> </A><A NAME="SLA_KBJ"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Select epoch prefix `B' or `J'.
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_KBJ (JB, E, K, J)</TT>
<P> </DL>
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<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>JB</EM></TD>
<TH ALIGN="LEFT"><B>I</B></TH>
<TD ALIGN="LEFT" NOWRAP>sla_DBJIN prefix status: 0=none, 1=`B', 2=`J'</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>E</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>epoch - Besselian or Julian</TD>
</TR>
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<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>K</EM></TD>
<TH ALIGN="LEFT"><B>C</B></TH>
<TD ALIGN="LEFT" NOWRAP>`B' or `J'</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>status: 0=OK</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTE:</STRONG>
<DD>The routine is mainly intended for use in conjunction with the
sla_DBJIN routine. If the value of JB indicates that an explicit
B or J prefix was detected by sla_DBJIN, a `B' or `J'
is returned to match. If JB indicates that no explicit B or J
was supplied, the choice is made on the basis of the epoch
itself; B is assumed for E <1984, otherwise J.
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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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