Vector<Acceleration, Frame> Ephemeris<Frame>::
ComputeGravitationalAccelerationOnMasslessBody(
not_null<DiscreteTrajectory<Frame>*> const trajectory,
Instant const& t) const {
auto const it = trajectory->Find(t);
DegreesOfFreedom<Frame> const& degrees_of_freedom = it.degrees_of_freedom();
return ComputeGravitationalAccelerationOnMasslessBody(
degrees_of_freedom.position(), t);
}
static std::vector<Instant> After(
not_null<FakeTrajectory const*> const trajectory,
Instant const& time) {
std::vector<Instant> after;
for (FakeTrajectory::Iterator it = trajectory->Find(time);
it != trajectory->End();
++it) {
after.push_back(*it.current());
}
return after;
}