void Scene::doTicks(int numTicks) {
    m_time += numTicks;

    for (unsigned int i = 0; i < m_bodies.size(); i++) {
        Planet *body = &m_bodies.at(i);
        if (body->getIsStar()) continue;

        int axialPeriod = (int)body->getAxialPeriod();
        float arot = (m_time % axialPeriod) / (float)axialPeriod;
        arot *= M_2PI;
        body->setAxialRotation(arot);
        body->calculateNewOrbitalPosition(numTicks);
    }
}