[填空题]
The Moon orbits the Earth such thqse e9t:4p 79/djf r4eq enf;gn zv8(iat the same siix8.gw7m jor6 de always faces the Earth. Determine the ratio of the Mo6xw 8jo igm7r.on’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$