Stabilizing the obliquity of a planet

It is said that the Moon plays a significant role on stabilizing the obliquity of Earth (or call it the axial tilt). Without it, the tilt of the planet is subject to great variations causing unpredictable climatic conditions on the planet. This is not ideal for life.

Scenario: An advanced civilization discovers a perfect planet that is just like Earth expect that the planet doesn't have a natural satellite. They really want to settle the planet and they are planning for a long term investment.

How can they minimize the changes in the planet's obliquity over long periods of time?

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Stabilizing the obliquity of a planet

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