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What (who) is precession - definition

PERIODIC CHANGE IN THE DIRECTION OF A ROTATION AXIS

Gyroscopic precession; Precess; Precessing; Geometric precession; Torque-induced precession; Torque-free precession; Equinoctial precession; Free precession; Lunisolar Precession; Gyroscopic Precession; Discovery of precession; Precession of the earth; Precession of the Earth; Precession of Perihelion; Precession of the axis; Free Precession; Astronomical precession; Planetary Precession; Planetary precession; Procession of the equinox; Stellar precession; General precession; General precession in longitude; Precession (astronomy); Precessed; Percession

Precession

·noun The act of going before, or forward.

precession

¦ noun

1. Physics the slow movement of the axis of a spinning body around another axis.

2. Astronomy the slow retrograde motion of the equinoctial points along the ecliptic, resulting in the earlier occurrence of equinoxes each year.

Derivatives

precess verb

precessional adjective

Origin

C16: from late L. praecessio(n-), from praecedere (see precede).

Precession

Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself.

https://en.wikipedia.org/wiki/Precession

Wikipedia

Precession

Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself. 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. In physics, there are two types of precession: torque-free and torque-induced.

In astronomy, precession refers to any of several slow changes in an astronomical body's rotational or orbital parameters. An important example is the steady change in the orientation of the axis of rotation of the Earth, known as the precession of the equinoxes.

https://en.wikipedia.org/wiki/Precession

Examples of use of precession

1. Precession is the slow turning of the long axis of a planet‘s elliptical orbit.

2. Already they see precession of the moon‘s orbits resulting from the irregular shape of Sylvia.

3. Then they come down out of the trees in a precession to find a hole in the ground in which to pupate and then emerge as a moth.

4. Using dynamical models of how the two Jupiter–size planets interact, they were able to calculate the masses of the two giant planets from the observed shapes and precession rates of their oval orbits.

5. "The last large event held at the court was to celebrate Jane‘s mother‘s birthday, three years ago." He added: "We have offered the neighbour hot drinks because this is a storm in a tea cup." Before handing over the petition of 200 signatures, a Land Rover playing brass music through a loudspeaker led a slow precession through the rural St Catherine valley.