Precession is a change in the orientation of the rotational axis of a rotating body. In other words, if the axis of rotation of a body is itself rotating about a second axis, that body is said to be precessing about the second axis. A motion in which the second Euler angle changes is called nutation.

Precession sentence example

1. The laws of motion of the ecliptic and equator are stated in the article Precession Of The Equinoxes.
2. It figured in astronomical tables until the time of Copernicus, but is now known to have no foundation in fact, being based on an error in Ptolemy’s determination of precession .

precession, precedence, precedencynoun. the act of preceding in time or order or rank (as in a ceremony) Synonyms: priority, antecedency, anteriority, precedence, precedency, antecedence.

Answer: The precession of the Earth’s rotational axis comes about due to tidal torques caused mostly by the differential pull on the Earth by the Moon and the Sun. These tidal torques cause the Earth to become less than spherical (oblate).

precession, 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.

Precession is the slow, toplike wobbling of the spinning Earth, with a period of about 25,772 years. Nutation (Latin nutare, “to nod”) superimposes a small oscillation, with a period of 18.6 years and an amplitude of 9.2 seconds of arc, upon this great slow movement.

Such a motion is called precession and consists of a cyclic wobbling in the orientation of Earth’s axis of rotation with a period of 25,772 years. Precession was the third-discovered motion of Earth, after the far more obvious daily rotation and annual revolution.

An example of precession and nutation is the variation over time of the orientation of the axis of rotation of the Earth. The effect of precession and nutation causes this frame of reference itself to change over time, relative to an arbitrary fixed frame.

precession, 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. The smooth, slow circling of a spinning top is precession, the uneven wobbling is nutation.

Precession refers to a change in the direction of the axis of a rotating object. The revolution of a planet in its orbit around the Sun is also a form of rotary motion. (In this case, the combined system of Earth and Sun is rotating.) So the axis of a planet’s orbital plane will also precess over time.

precession The action of a couple whose axis is perpendicular to the rotational axis (a torque) on a rotating body causing its axis of rotation to trace out a path about an average position, instead of having a constant alignment, i.e. the axis of rotation itself revolves conically about a central point.

This wobble motion is called axial precession, also known as precession of the equinoxes. It is caused by the gravitational force from the Sun, the Moon, and other planets . Axial precession can be described as a slow gyration of Earth’s axis about another line intersecting it. A complete wobble of Earth’s axis takes around 26,000 years.

The rate of precession of the earth equals 1 degree every 72 years . Precession of the equinox is a twelve handed clock, much like the clock you see on the wall. The twelve numbers are the zodiac constellations, and the hand is the eyesight of an observer looking east on the day of the spring equinox.

The direction a gyro will precess also depends on the direction the gyro is spinning. Precession is actually the result of two forces: angular momentum (spinning force) and the applied force (torque). The direction of precession is always offset from the direction of the applied force.