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Old 06-12-2016, 12:06 PM
eburacum45 eburacum45 is offline
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The late Paul Birch of the British Interplanetary Society described one possibility in some detail here
http://www.orionsarm.com/fm_store/MoveAPlanet.pdf
In short, you send a stream of iron pellets made from asteroids between a ring of electromagnets in orbit around the Earth and another ring around a larger object (usually the Sun) which acts as an anchor. The force used to deflect these pellets will act on the Earth (and to a lesser extent on the anchor object) and gradually move them both with respect to each other.

Birch was primarily concerned with moving Venus, but the same technique could be used on Earth.