## overview

In astronomy, perturbation is the complex motion of a large body subjected to forces other than the gravitational force of a single other large mass. Other forces may include the off-center attraction of a third (fourth, fifth, etc.) body, resistance, and an oblate or otherwise amorphous body from an atmosphere. When a planet A exercises by simply taking the gravitational force of the sun, its orbit becomes an ellipse determined by Kepler's law, but if B acts on another planet's attraction A, A's orbit will not be exactly an ellipse. At this time, the deviation from the elliptical orbit is called perturbation by planet B. When trying to calculate the motion of A dynamically under the gravity of the sun and B, this is a three body problem and absolutely unsolvable. but the gravity of B of A is much smaller than the attraction of the sun. So we can predict A's orbit by calculating A's elliptical orbit (perturbation), just by taking into account the sun's attraction and calculating how the elliptical element changes due to gravity. B.) This method is called perturbation theory. Changes in elliptical elements due to perturbations are periodic ones (periodic perturbation) and infinitely large ones over time (perturbation). The existence of Neptune Pluto has been predicted theoretically from Uranus perturbation analysis. Anxious wheel, Zeeman effect, Stark effect, etc. It is used in quantum mechanics to explain, and it is possible for particles to oscillate, absorb, disperse, etc. Calculates probability.→ See also secular unrest | celestial mechanics | equinox

_{Read: 39}