Rotation - when Earth/planet spins around itself (day), Mean solar day - 1 rotation of Earth from 12pm -12pm (24 hours), Sidereal day - 23hours 56 min and 4 seconds 360' rotation, Revolution - time takes for Earth to travel around the sun, Procession - Earth's axis points in different directions over time, Nutation - wobble; occurs as planet rotates, Barycenter - center of mass between 2 objects/balance, Causes seasons  - tilt of the earth, Summer season - the part of Earth that's tilted towards the sun, Winter season - the part of Earth that's tilted away from the sun,

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