[填空题]
The Moon orbits the Earq9zo(xr2ozi j8(6v 2v.iey ngth such that the samm,,bp t uxr u3 (sijv.( o2oes4i*dsl8e side always faces the Earth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as . jsbtv(ru3iou*x ,4ps82 el(si,mdo a particle orbiting the Earth.) $\times10^{ -6}$