[填空题]
The Moon orbits the Eac y9knc(:xbm3 tx e ;c.z+noc/rth succp5qt w11c+ lwh that the same 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 tcpl1wt cqw51+ he latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$