old_contents: import numpy as np
  
  from .base import AnalyticalPropagator
  from ..constants import Earth
  from ..dates import timedelta
  
  
  class Kepler(AnalyticalPropagator):
      """Analytical propagator only taking the evolution of the Mean anomaly"""
  
      @property
      def orbit(self):
          return self._orbit if hasattr(self, "_orbit") else None
  
      @orbit.setter
      def orbit(self, orbit):
          self._orbit = orbit.copy(form="keplerian_mean")
  
      def propagate(self, date):
  
          if type(date) is timedelta:  # pragma: no cover
              date = self.orbit.date + date
  
          delta_t = (date - self.orbit.date).total_seconds()
  
          n = self.orbit.infos.n
  
          delta = n * delta_t
  
          new = self.orbit.copy()
          new.date = date
          new[5] = (self.orbit[5] + delta) % (2 * np.pi)
  
          return new.copy(form="cartesian")
  
new_contents: import numpy as np
  
  from .base import AnalyticalPropagator
  from ..constants import Earth
  from ..dates import timedelta
  
  
  class Kepler(AnalyticalPropagator):
      """Analytical propagator only taking the evolution of the Mean anomaly"""
  
      @property
      def orbit(self):
          return self._orbit if hasattr(self, "_orbit") else None
  
      @orbit.setter
      def orbit(self, orbit):
          self._orbit = orbit.copy(form="keplerian_mean")
  
      def propagate(self, date):
  
          if type(date) is timedelta:  # pragma: no cover
              date = self.orbit.date + date
  
          delta_t = (date - self.orbit.date).total_seconds()
  
          n = self.orbit.infos.n
  
          delta = n * delta_t
  
          new = self.orbit.copy()
          new.date = date
          new[5] = self.orbit[5] + delta
  
          return new.copy(form="cartesian")
  
subject: fix kepler : remove modulo that messes with hyperbolic orbits