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<TITLE>palPrec palPrec
- Form the matrix of precession between two epochs (IAU 2006)
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<H2><A NAME="SECTION000355000000000000000"></A><A NAME="____palPrec_"></A>
<BR>
palPrec
palPrec
- Form the matrix of precession between two epochs (IAU 2006)
</H2>
<DL>
<DT><STRONG>Description:</STRONG></DT>
<DD><DL>
<DD>The IAU 2006 precession matrix from ep0 to ep1 is found and
returned. The matrix is in the sense V(EP1) = RMATP <SPAN CLASS="MATH"><IMG
WIDTH="13" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="img1.png"
ALT="$*$"></SPAN> V(EP0).
The epochs are TDB (loosely TT) Julian epochs.
<P>
Though the matrix method itself is rigorous, the precession
angles are expressed through canonical polynomials which are
valid only for a limited time span of a few hundred years around
the current epoch.
</DD>
</DL>
<BR>
</DD>
<DT><STRONG>Invocation:</STRONG></DT>
<DD><DL>
<DD><TT> palPrec( double ep0, double ep1, double rmatp[3][3] )
</TT>
</DD>
</DL>
<BR>
</DD>
<DT><STRONG>Arguments:</STRONG></DT>
<DD>
<BR> <DL>
<DT><STRONG>
ep0 = double (Given)
</STRONG></DT>
<DD>
Beginning epoch
</DD>
<DT><STRONG>
ep1 = double (Given)
</STRONG></DT>
<DD>
Ending epoch
</DD>
<DT><STRONG>
rmatp = double[3][3] (Returned)
</STRONG></DT>
<DD>
Precession matrix
</DD>
</DL>
<BR>
</DD>
</DL>
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