Summary Earth's axis of rotation continuously changes relative to the plane of it's orbit due to procession of nutation just like the axis of a spinning top. Scientists recently announced a rare movement in Earth axis relative to its surface which is also know to have happened on Mars and some of the moons in the Solar System. The shift is thought to be to a major change in continental drift or perhaps movement in Earth's mantle plumes which may have activated the Deccan traps at about the same time.

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