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Because the moon's orbit is not circular, it *can't* keep one face
precisely oriented toward Earth at all times. It's angular
velocity of rotation is roughly constant while its angular
velocity of revolution is decidedly not.
BTW, it's interesting to consider this phenomenon from a driven
oscillator point of view. The tidal force effectively drives the
moon at a frequency of about 1 cycle per month.
But since that
frequency is *way* above the resonant frequency, the moon's
rotational inertia dominates.