Index: /trunk/psLib/src/astro/psTime.c
===================================================================
--- /trunk/psLib/src/astro/psTime.c	(revision 9979)
+++ /trunk/psLib/src/astro/psTime.c	(revision 9980)
@@ -10,6 +10,6 @@
  *  @author Ross Harman, MHPCC
  *
- *  @version $Revision: 1.102 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2006-11-01 21:56:27 $
+ *  @version $Revision: 1.103 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2006-11-15 00:26:40 $
  *
  *  Copyright 2004-2005 Maui High Performance Computing Center, University of Hawaii
@@ -956,5 +956,5 @@
     // Convert psTime to MJD
     double MJD = psTimeToMJD(time);
-    if (MJD == NAN) {
+    if (isnan(MJD)) {
         psError(PS_ERR_BAD_PARAMETER_VALUE, false,
                 "Time conversion to MJD failed.  Invalid input time.\n");