What is precession?

  • (noun): The act of preceding in time or order or rank (as in a ceremony).
    Synonyms: precedence, precedency
    See also — Additional definitions below


Precession is a change in the orientation of the rotational axis of a rotating body. It can be defined as a change in direction of the rotation axis in which the second Euler angle (nutation) is constant. In physics, there are two types of precession: torque-free and torque-induced.

Read more about Precession.

Some articles on precession:

SERF - Typical Operation
... can take advantage of low noise diode lasers to polarize and monitor spin precession ... An orthogonal probe beam detects the precession using optical rotation of linearly polarized light ... tip by a very small angle because the precession frequency is slow compared to the relaxation rates ...
Apsidal Precession
... In celestial mechanics, perihelion precession, apsidal precession or orbital precession is the precession (rotation) of the orbit of a celestial body ...
Two-body Problem In General Relativity - Historical Context - Apsidal Precession
... See also Apsidal precession and Laplace–Runge–Lenz vector If the potential energy between the two bodies is not exactly the 1/r potential of Newton's gravitational law but differs only ... This apsidal precession is observed for all the planets orbiting the Sun, primarily due to the oblateness of the Sun (it is not perfectly spherical) and the attractions of the other planets for one another ... furthest distance of the orbit (the periapsis and apoapsis, respectively) apsidal precession corresponds to the rotation of the line joining the apsides ...
Astronomy - Perihelion Precession
... This is called perihelion precession or apsidal precession ... Discrepancies between the observed perihelion precession rate of the planet Mercury and that predicted by classical mechanics were prominent among the forms of ... See also nodal precession ...
Lense–Thirring Precession - Derivation
... Therefore the Earth introduces a precession on all gyroscopes in a stationary system surrounding the Earth ... This precession is called the Lense–Thirring precession with a magnitude As an example the latitude of the city of Nijmegen in the Netherlands is used for reference ... This latitude gives a value for the Lense–Thirring precession of The total relativistic precessions on Earth is given by the sum of the De Sitter precession and the Lense–Thirring ...

More definitions of "precession":

  • (noun): The motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone.

Famous quotes containing the word precession:

    But how is one to make a scientist understand that there is something unalterably deranged about differential calculus, quantum theory, or the obscene and so inanely liturgical ordeals of the precession of the equinoxes.
    Antonin Artaud (1896–1948)