**Celestial mechanics** — is the branch of astrophysics that deals with the motions of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such as stars and planets to produce ephemeris data. Orbital… … Wikipedia

**Orbit determination** — is a branch of astronomy specialised in calculating, and hence predicting, the orbits of objects such as moons, planets, and spacecraft . These orbits could be orbiting the Earth, or other bodies. The determination of the orbit of newly observed… … Wikipedia

**Orbit insertion** — is the spaceflight operation of adjusting a spacecraft’s momentum to allow for entry into a stable orbit around a planet, moon, or other celestial body.[1] This maneuver involves either deceleration from a speed in excess of the respective body’s … Wikipedia

**Celestial navigation** — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… … Wikipedia

**orbit** — [ôr′bit] n. [MFr orbite < ML orbita < L, path, track < orbis, a circle, wheel] 1. the bony cavity containing the eye; eye socket 2. [L orbita] a) the actual or imaginary path taken by a celestial body during its periodic revolution… … English World dictionary

**celestial mechanics** — pl.n. the branch of astronomy that deals with the motion and positions of celestial objects in orbit … English World dictionary

**orbit** — ► NOUN 1) the regularly repeated elliptical course of a celestial object or spacecraft around a star or planet. 2) a field of activity or influence. 3) the path of an electron round an atomic nucleus. 4) Anatomy the eye socket. ► VERB (orbited,… … English terms dictionary

**celestial mechanics** — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… … Universalium

**Orbit** — This article is about orbits in celestial mechanics, due to gravity. For other uses, see Orbit (disambiguation). A satellite orbiting the Earth has a tangential velocity and an inward acceleration … Wikipedia

**Orbit of the Moon** — Not to be confused with Lunar orbit in the sense of a selenocentric orbit, that is, an orbit around the Moon The Moon completes its orbit around the Earth in approximately 27.3 days (a sidereal month). The Earth and Moon orbit about their… … Wikipedia