# mean motion

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## mean motion

The constant angular speed that is required for a celestial body to complete one revolution of an (undisturbed) elliptical orbit of a specified semimajor axis.

## Mean Motion

(religion, spiritualism, and occult)

Because celestial bodies move in elliptical orbits, their speed varies depending upon their location. Mean motion refers to their average speed.

## Mean Motion

an element, or parameter, of the orbit of a celestial body that characterizes the dimensions of the orbit. The relation between the mean motion and the semimajor axis of the orbit is given by Kepler’s third law: the larger the semimajor axis, the more slowly the body, on the average, moves in its orbit. (SeeORBIT OF A CELESTIAL BODY.)

## mean motion

[′mēn ′mō·shən]
(astronomy)
The speed which a planet or its satellite would have if it were moving in a circular orbit with radius equal to its distance from the sun or a central planet with a period equal to its actual period.
References in periodicals archive ?
(3) identify single TLEs with inconsistent mean motion, as well as entire sequences thereof, using a sliding window approach;
For the left plots TLEs filtered on mean motion were used, whereas for the right plots the TLEs were filtered on mean motion and perigee radius.
It can also be applied to social relationships and mentalities associated with the hierarchical distinctions which characterize Melanesian societies.' (Ozanne-Rivierre 1997:90) She offers an example where motion 'up' can mean motion towards the place of a person of higher rank than oneself, regardless of the physical location of that place.
The motion of the epicycle's center on the deferent is the mean motion of the object, or the average position at which it will be found.
Ptolemy first finds observations (some dating from Babylonian times, some made by himself) when a planet is on the line between the deferent and the center of the planet's epicycle; these enable him to determine the mean motion. Next he finds observations that give a position for the object that differs from the mean motion; the point of greatest difference must equal the radius of the epicycle.
The perturbing body m is in a circular orbit with semimajor axis a and mean motion n.
The double averaged model considers the averages over the mean motion of the satellite and the mean motion of the disturbing body.

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