[填空题]
The Moon orbits the Earth such that e5x n8qr9 hnq5the same s9r+a3 s *wpu6f xeh*p8bqlem5brct88ide 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 a x6c* 9 5*lrem b88t3uwqpp+ae8 hrsb fparticle orbiting the Earth.) $\times10^{ -6}$