'Compare Greenwich Mean Sidereal Time with what was found earlier'

def test_gmst(self):

    gmst_compare = np.array([6.5968497894730564, 18.629426164144697, 18.629704702452862, 18.629983240761003, 6.662838182889964])
    gmst = self.t1.sidereal_time('mean', 'greenwich')
    assert allclose_hours(gmst.value, gmst_compare)
