Circular motion performed by a spinning object about a fixed line in space which is not its axis of rotation (spin)
The slow change in the direction of the axis of a spinning object, caused by some external influence
A modern term, derived from the precession of the equinoxes and meaning a motion around a cone of the rotation axis of a spinning body
The slow gyration of the earth's axis around the pole of the ecliptic, caused mainly by the gravitational pull of the sun and moon
Phenomenon associated with the action of a gyroscope or a spinning top and consisting of a comparatively slow rotation of the axis of rotation of a spinning body about a line intersecting the spin axis. It arises as a result of external torque acting on the body. One example of precession is the smooth, slow circling of a spinning top (the uneven wobbling is called nutation). Precession of the earth's axis of rotation is the reason that the positions of celestial bodies appear to drift systematically with the passage of time. See also precession of the equinoxes
The slow, smooth increase or decrease of an angle When used to describe the changing orientation or an orbit, one can imagine an ellipse (the orbit) spinning around a central point When used to describe a spinning body, it is the circular gyration of the body's rotation axis
The tendency of the Earth's axis to wobble in space over a period of 23,000 years The Earth's precession is one of the factors that results in the planet receiving different amounts of solar energy over extended periods of time
wobble in Earth's axis that, over a cyclical period of 23,000 years, influences the time at which the earth is closest to and farthest from the sun; ultimately, this affects the timing of the changes of the seasons on Earth
Circular motion about the axis of rotation of a body; fixed with respect to the stars The Earth is a giant gyroscope whose axis passes through the North and South Poles and this axis precesses with a period of 27,700 years