Index: /trunk/doc/pslib/psLibSDRS.tex
===================================================================
--- /trunk/doc/pslib/psLibSDRS.tex	(revision 5937)
+++ /trunk/doc/pslib/psLibSDRS.tex	(revision 5938)
@@ -1,3 +1,3 @@
-%%% $Id: psLibSDRS.tex,v 1.372 2006-01-06 02:39:46 jhoblitt Exp $
+%%% $Id: psLibSDRS.tex,v 1.373 2006-01-07 03:10:54 price Exp $
 \documentclass[panstarrs,spec]{panstarrs}
 
@@ -6954,8 +6954,23 @@
 typedef enum {
   PS_PRECESS_ROUGH,
-  PS_PRECESS_COMPLETE,
   PS_PRECESS_IAU2000A,
+  PS_PRECESS_COMPLETE_A,
+  PS_PRECESS_COMPLETE_B
 } psPrecessMethod;
 \end{datatype}
+
+\code{PS_PRECESS_ROUGH} indicates that an approximate precession
+rotation is determined from a cubic polynomial in the time difference
+(ADD 3.4.3).  \code{PS_PRECESS_IAU2000A} indicates that the precession
+rotation is determined from differencing the two rotations obtained
+from applying the IAU 2000A model (\code{psEOC_PrecessionModel},
+followed by \code{psSphereRot_CEOtoGCRS}) at each epoch.
+\code{PS_PRECESS_COMPLETE_A} and \code{PS_PRECESS_COMPLETE_B}
+indicates that the precession rotation is the same as for
+\code{PS_PRECESS_IAU2000A}, except that the earth pole correction
+published by the IERS is included (using the appropriate bulletin in
+\code{psEOC_PrecessionCorr} --- \code{PS_IERS_A} for
+\code{PS_PRECESS_COMPLETE_A}, and \code{PS_IERS_B} for
+\code{PS_PRECESS_COMPLETE_B}).
 
 \subsection{Atmospheric Effects}