perturbed motion
61perturbation — noun Date: 14th century 1. the action of perturbing ; the state of being perturbed 2. a disturbance of motion, course, arrangement, or state of equilibrium; especially a disturbance of the regular and usually elliptical course of motion of a… …
62Comet Shoemaker-Levy 9 — Shoemaker Levy redirects here. For other Shoemaker Levy comets see List of periodic comets. Infobox Comet name=SL9 (Shoemaker Levy) caption=Image of Comet Shoemaker Levy 9 fragments (total: 21), taken on May 17, 1994 discoverer= Carolyn Shoemaker …
63Kalman filter — Roles of the variables in the Kalman filter. (Larger image here) In statistics, the Kalman filter is a mathematical method named after Rudolf E. Kálmán. Its purpose is to use measurements observed over time, containing noise (random variations)… …
64Molniya orbit — For other uses, see Molniya (disambiguation). Figure 1: The Molniya orbit. Usually the period from perigee + 2 hours to perigee + 10 hours is used to transmit to the northern hemisphere Molniya orbit is a type of highly elliptical orbit with an… …
65Mean longitude — In astrodynamics or celestial dynamics, mean longitude is the longitude at which an orbiting body could be found if its orbit were circular, and free of perturbations, and if its inclination were zero. Both the mean longitude and the true… …
66Orbital station-keeping — In astrodynamics orbital station keeping is a term used to describe the orbital maneuvers made by thruster burns that are needed to keep a spacecraft in a particular assigned orbit. For many Earth satellites the effects of the non Keplerian… …
67Duffing equation — A Poincaré section of the forced Duffing equation suggesting chaotic behaviour The Duffing equation is a non linear second order differential equation used to model certain damped and driven oscillators. The equation is given by …
68Volleyball jargon — This is a list of the more common English volleyball jargon terms:General terms*Ace : A serve which lands in the receiving team s court without being touched by the receiving team, or one that is touched by only one member of the receiving team,… …
69earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …
70mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …
