[填空题]
The Moon orbits the Earth sjhc1-t ok:d a5uch that thebgg0ojo)0.ro;rl -mn (gm qc: same side always faces the Earth. Determine -g0 mgonmjor(b :rq g c;o.l)0the 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 particle orbiting the Earth.) $\times10^{ -6}$