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<H2><A NAME="SECTION0004129000000000000000">SLA_PDQ2H - H.A. for a Given P.A.</A>
<A NAME="xref_SLA_PDQ2H"> </A><A NAME="SLA_PDQ2H"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Hour Angle corresponding to a given parallactic angle
(double precision).
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_PDQ2H (P, D, Q, H1, J1, H2, J2)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>P</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>latitude</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>D</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>declination</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>Q</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>azimuth</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>H1</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>hour angle: first solution if any</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J1</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>flag: 0 = solution 1 is valid</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>H2</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>hour angle: second solution if any</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J2</EM></TD>
<TD ALIGN="LEFT"><B>I</B></TD>
<TD ALIGN="LEFT" NOWRAP>flag: 0 = solution 2 is valid</TD>
</TR>
</TABLE></DL>
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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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