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M7L1: earth's motion through space // Nitya Kapilavayi - Coggle Diagram

- - - - Precession
        
        Precession is a wobble in the Earth's rotational axis. The Earth's precessional period is 26,000 years. This is caused by the gravitational force of the pull from the Moon and the Sun. When the pull is not equal, precession occurs.
        
        Nutation
        
        Nutation occurs during precession. It is an irregularity in precession where the force of the Moon and the Sun on the Earth causes it to "nod" in the wobble. The Earth's nutation period is 18.6 years.