old_contents: import pytest
  from astropy.coordinates import solar_system_ephemeris
  from astropy.time import Time
  
  solar_system_ephemeris.set("builtin")
  
  
  @pytest.fixture
  def earth_perihelion():
      return Time("2020-01-05 07:47:00", scale="tdb")
  
new_contents: import pytest
  from astropy import units as u
  from astropy.coordinates import solar_system_ephemeris
  from astropy.time import Time
  
  from poliastro.bodies import Earth, Sun
  from poliastro.twobody import Orbit
  
  solar_system_ephemeris.set("builtin")
  
  
  @pytest.fixture
  def earth_perihelion():
      return Time("2020-01-05 07:47:00", scale="tdb")
  
  
  @pytest.fixture
  def elliptic():
      # Data from Vallado, example 2.4
      r0 = [1_131.340, -2_282.343, 6_672.423] << u.km
      v0 = [-5.64305, 4.30333, 2.42879] << (u.km / u.s)
      return Orbit.from_vectors(Earth, r0, v0)
  
  
  @pytest.fixture()
  def hyperbolic():
      r = [
          1.197659243752796e09,
          -4.443716685978071e09,
          -1.747610548576734e09,
      ] * u.km
      v = (
          [5.540549267188614e00, -1.251544669134140e01, -4.848892572767733e00]
          * u.km
          / u.s
      )
      epoch = Time("2015-07-14 07:59", scale="tdb")
      return Orbit.from_vectors(Sun, r, v, epoch)
  
subject: Add more Orbit fixtures