# angular momentum

**angular momentum** The momentum of a body rotating in a plane around a point. It is formally the product of the mass of the body, the radius of the orbit, and the square of the angular velocity (*mrω*^{2}). Because of its rotation about its axis, the Earth has rotational angular momentum, and orbital angular momentum on account of its annual revolution around the Sun. The angular momentum of the Earth-Moon system (3.45 × 10^{34} rad/kg/m^{2}/s) is the sum of the rotational angular momentum of the Earth and the Moon's orbital angular momentum, and is high compared to that of the other terrestrial planets.

#### More From encyclopedia.com

Tides , Tides
Introduction
A tide is the alternating rise and fall in sea level that occurs at marine coastal regions each day. The sea level change is cause… perigee , perigee (astron.) point in the orbit of a planet that is nearest to the earth. XVI. In early use varying with forms directly repr. L. and Gr.; — F. p… Planetary Science , CONCEPT
The term planetary science encompasses a whole range of studies involving a combination of earth sciences and astronomy. Sometimes known as p… Quadrature , quadrature, in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point… Ecliptic , e·clip·tic / iˈkliptik/ • n. Astron. a great circle on the celestial sphere representing the sun's apparent path during the year, so called because l… apogee , apogee •haji • algae • Angie •argy-bargy, Panaji •edgy, sedgy, solfeggi, veggie, wedgie •cagey, stagy •mangy, rangy •Fiji, gee-gee, squeegee •Murrumb…

#### You Might Also Like

#### NEARBY TERMS

**Angular momentum**