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The torque-free precession rate of an object with an axis of symmetry, such as a disk, spinning about an axis not aligned with that axis of symmetry can be calculated as follows: [1] = where ω p is the precession rate, ω s is the spin rate about the axis of symmetry, I s is the moment of inertia about the axis of symmetry, I p is moment ...
The precession of Earth's axis is a very slow effect, but at the level of accuracy at which astronomers work, it does need to be taken into account on a daily basis. Although the precession and the tilt of Earth's axis (the obliquity of the ecliptic) are calculated from the same theory and are thus related one to the other, the two movements ...
The apsidal precession is the rate of change of ω through time, dω / dt . Animation of Moon 's orbit around Earth - Polar view Moon · Earth. In celestial mechanics, apsidal precession (or apsidal advance) [1] is the precession (gradual rotation) of the line connecting the apsides (line of apsides) of an astronomical body's orbit.
Earth's rotation axis moves with respect to the fixed stars (inertial space); the components of this motion are precession and nutation. It also moves with respect to Earth's crust; this is called polar motion. Precession is a rotation of Earth's rotation axis, caused primarily by external torques from the gravity of the Sun, Moon and other bodies.
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.
Gyroscopic precession is torque induced. It is the rate of change of the angular momentum that is produced by the applied torque. Precession produces counterintuitive dynamic results such as a spinning top not falling over. Precession is used in aerospace applications for sensing changes of attitude and direction.
Bicycle pedals are left-threaded on the left-hand crank so that precession tightens the pedal rather than loosening it. This may seem counter-intuitive since the pedals rotate in the direction that would unscrew them from the cranks, but the torque exerted due to the precession is several orders of magnitude greater than that caused by bearing friction or even a jammed pedal bearing.
Lunar precession is a term used for three different precession motions related to the Moon. First, it can refer to change in orientation of the lunar rotational axis with respect to a reference plane , following the normal rules of precession followed by spinning objects.