void Interaction::addVelocityOnEarth(Phase &dxdt, const vector3D &velocity) { dxdt.addVelocityOnBodyInDifferentialPhase(earth, velocity); }
void Interaction::addVelocityOnMoon(Phase &dxdt, const vector3D &velocity) { dxdt.addVelocityOnBodyInDifferentialPhase(moon, velocity); }