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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.
In astronomy, axial precession is a gravity-induced, slow, ... For example, this happens at the equinoxes in the case of the interaction with the Sun. This can be ...
Precession is the process of a round part in a round hole, rotating with respect to each other, ... For example, this is a common problem in bicycle pedals, thus on ...
An example of precession and nutation is the variation over time of the orientation of the axis of rotation of the Earth. This is important because the most commonly used frame of reference for measurement of the positions of astronomical objects is the Earth's equator — the so-called equatorial coordinate system. The effect of precession and ...
For example, the Hulse–Taylor binary pulsar PSR B1913+16 (a pair of neutron stars in which one is detected as a pulsar) has an observed precession of over 4° of arc per year (periastron shift per orbit only about 10 −6). This precession has been used to compute the masses of the components.
The combined effect of precession with eccentricity is that proximity to the Sun occurs during different astronomical seasons. [5] Milankovitch studied changes in these movements of the Earth, which alter the amount and location of solar radiation reaching the Earth. This is known as solar forcing (an example of radiative forcing). Milankovitch ...
Foucault-like precession is observed in a virtual system wherein a massless particle is constrained to remain on a rotating plane that is inclined with respect to the axis of rotation. [ 16 ] Spin of a relativistic particle moving in a circular orbit precesses similar to the swing plane of Foucault pendulum.
Larmor precession is important in nuclear magnetic resonance, magnetic resonance imaging, electron paramagnetic resonance, muon spin resonance, and neutron spin echo. It is also important for the alignment of cosmic dust grains, which is a cause of the polarization of starlight .