docs: def in_distance(self, distance, fields, points, annotate='_ed_distance'):
          """Filter rows inside a circunference of radius distance `distance`
  
              :param distance: max distance to allow
              :param fields: `tuple` with the fields to filter (latitude, longitude)
              :param points: center of the circunference (latitude, longitude)
              :param annotate: name where the distance will be annotated
  
          """
          clone = self._clone()
          return clone.annotate(
              **{annotate: EarthDistance([
                  LlToEarth(fields), LlToEarth(points)])
              }).filter(**{'{0}__lte'.format(annotate): distance})