def separation(self,ra,dec):
        """Compute the separation between self and (ra,dec)"""

        import ephem
        return ephem.separation((self.ra,self.dec),(ra,dec))
def separation ( self , ra , dec ) : import ephem return ephem . separation ( ( self . ra , self . dec ) , ( ra , dec ) )
Compute the separation between self and (ra,dec)