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+.help skequatorial Mar00 Skywcs
+.ih
+NAME
+skequatorial -- apply pm and transform between equatorial coordinate systems
+.ih
+SYNOPSIS
+call sk_equatorial (incoo, outcoo, ilng, ilat, ipmlng, ipmlat, px, rv,
+	            olng, olat)
+
+.nf
+pointer	incoo		# the input sky coordinate descriptor
+pointer	outcoo		# the output sky coordinate descriptor
+double ilng, ilat	# the input sky coordinates in radians
+double ipmlng, ipmlat	# the input proper motions in radians  / year
+double	px		# the input parallax in arcsec
+double	rv		# the input radial velocity in km / sec (+ve receding)
+double olng, olat	# the output sky coordinates in radians
+.fi
+.ih
+ARGUMENTS
+.ls  incoo    
+The input sky coordinate descriptor.
+.le
+.ls  outcoo    
+The output sky coordinate descriptor.
+.le
+.ls ilng, ilat
+The input sky coordinates in radians.
+.le
+.ls ipmlng, ipmlat
+The input proper motions. If proper motions are unknown do not set ipmlng
+and ipmlat to 0.0, use sk_ultran instead. Note that the ra proper motion
+is in dra  not cos (dec) * dra units.
+.le
+.ls px
+The parallax in arcseconds. Use 0.0 if the proper motion is unknown unknown. 
+The parallax value is used only if proper motions are defined.
+.le
+.ls rv
+The radial velocity in km / sec. Use 0.0 if the radial velocity is unknown.
+The radial velocity value is used only if proper motions are defined.
+.le
+.ls olng, olat
+The output sky coordinates in radians.
+.le
+.ih
+DESCRIPTION
+The coordinates in the input sky coordinate system are converted to 
+coordinates in the output sky coordinate system.
+.ih
+NOTES
+If the proper motions are undefined use the routine sk_ultran. Zero valued
+proper motions are not the same as undefined proper motions.
+
+.ih
+SEE ALSO
+sk_lltran, sk_ultran
+.endhelp