Jul16-09, 06:18 PM
It does remain in a virtually constant direction provided you're remaining at the same location on the Earth.
Since your goal is to measure how the Moon changes the direction of down (regardless of what direction that may be), then Yes, that will work provided your pendulum is long enough that you can measure the deviation.
The main complication would be cancelling out the noise from the Sun and the planets since their geometric configuration will affect the direction of "down" as well. In practice, screening out the unwanted noise to measure the desired attribute is just part of the challenge (often the largest part of the challenge).
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