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+<!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 -->
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+<HEAD>
+<TITLE>SLA_CLYD - Calendar to Year, Day</TITLE>
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+<H2><A NAME="SECTION000421000000000000000">SLA_CLYD - Calendar to Year, Day</A>
+<A NAME="xref_SLA_CLYD">&#160;</A><A NAME="SLA_CLYD">&#160;</A>
+</H2>
+ <DL>
+<DT><STRONG>ACTION:</STRONG>
+<DD>Gregorian calendar date to year and day in year, in a Julian
+calendar aligned to the 20th/21st century Gregorian calendar.
+<P> <DT><STRONG>CALL:</STRONG>
+<DD><TT>CALL sla_CLYD (IY, IM, ID, NY, ND, J)</TT>
+<P> </DL>
+<P> <DL>
+<DT><STRONG>GIVEN:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>IY,IM,ID</EM></TD>
+<TH ALIGN="LEFT"><B>I</B></TH>
+<TD ALIGN="LEFT" NOWRAP>year, month, day in Gregorian calendar</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>RETURNED:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>NY</EM></TD>
+<TH ALIGN="LEFT"><B>I</B></TH>
+<TD ALIGN="LEFT" NOWRAP>year (re-aligned Julian calendar)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>ND</EM></TD>
+<TD ALIGN="LEFT"><B>I</B></TD>
+<TD ALIGN="LEFT" NOWRAP>day in year (1 = January 1st)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>J</EM></TD>
+<TD ALIGN="LEFT"><B>I</B></TD>
+<TD ALIGN="LEFT" NOWRAP>status:</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
+<TD ALIGN="LEFT"><B></B></TD>
+<TD ALIGN="LEFT" NOWRAP> 0 = OK</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
+<TD ALIGN="LEFT"><B></B></TD>
+<TD ALIGN="LEFT" NOWRAP> 1 = bad year (before -4711)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
+<TD ALIGN="LEFT"><B></B></TD>
+<TD ALIGN="LEFT" NOWRAP> 2 = bad month</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM></EM></TD>
+<TD ALIGN="LEFT"><B></B></TD>
+<TD ALIGN="LEFT" NOWRAP> 3 = bad day</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>NOTES:</STRONG>
+<DD><DL COMPACT>
+<DT>1.
+<DD>The purpose of sla_CLYD is to support sla_EARTH,
+sla_MOON and sla_ECOR.
+<DT>2.
+<DD>Between 1900&nbsp;March&nbsp;1 and 2100&nbsp;February&nbsp;28 it returns answers
+ which are consistent with the ordinary Gregorian calendar.
+ Outside this range there will be a discrepancy which increases
+ by one day for every non-leap century year.
+ <DT>3.
+<DD>When an invalid year or month is supplied (status J&nbsp;=&nbsp;1 or J&nbsp;=&nbsp;2)
+ the results are <B>not</B> computed. When a day is
+ supplied which is outside the conventional range (status J&nbsp;=&nbsp;3)
+ the results <B>are</B> computed.
+ </DL></DL>
+<BR> <HR>
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+<BR>
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+<BR>
+<B> Previous:</B> <A NAME="tex2html759" HREF="node33.html">SLA_CLDJ - Calendar to MJD</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>
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