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+.help sksetd Mar00 Skywcs
+.ih
+NAME
+sksetd -- set a double sky coordinate descriptor parameter
+.ih
+SYNOPSIS
+include <skywcs.h>
+
+call sk_setd (coo, parameter, dval)
+
+.nf
+pointer	coo		# the input sky coordinate descriptor
+int	parameter	# the double parameter to be set
+double	dval		# the value of the parameter to be set
+.fi
+.ih
+ARGUMENTS
+.ls  coo    
+The sky coordinate descriptor.
+.le
+.ls parameter
+The parameter to be set. The double parameter definitions in skywcs.h are:
+.nf
+	S_VXOFF		# the logical ra / longitude offset in pixels
+	S_VYOFF		# the logical dec / latitude offset in pixels
+	S_VXSTEP	# the logical ra / longitude step size in pixels
+	S_VYSTEP	# the logical dec / latitude step size in pixels
+	S_EQUINOX	# the equinox in years
+	S_EPOCH		# the MJD of the observation 
+.fi
+.le
+.ls dval
+The value of the parameter to be set.
+.le
+.ih
+DESCRIPTION
+Sk_setd sets the values of double sky coordinate descriptor parameters.
+.ih
+NOTES
+The offsets and step sizes default to 0 and 1 for both axes. However
+if the sky coordinate descriptor was derived from an input image section, e.g.
+"dev$ypix[100:300,100:300]" these numbers may assume other values in some
+circumstances.
+
+The equinox and epoch of observation are normally set by the calling program
+when the sky coordinate descriptor is initialized, e.g. they default
+to 2000.0 and  51544.50000 if the input coordinate system was "fk5".
+
+In most cases these parameters should not be set by the user.
+.ih
+SEE ALSO
+skseti, sksets
+.endhelp