[填空题]
The Moon orbits the Eart w1u.yp8od f1th such that the same dr tvdy ;k59+gside always faces the Earth. Determine the ratio of t+vdt 9k; ydrg5he 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.) $\times10^{ -6}$