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horizon

(Encyclopedia)horizon, in astronomy, roughly circular line bounding an observer's view of the surface of the earth where the sky and earth seem to meet. This is the visible horizon. At sea the visible horizon is a ...

celestial sphere

(Encyclopedia)celestial sphere, imaginary sphere of infinite radius with the earth at its center. It is used for describing the positions and motions of stars and other objects. For these purposes, any astronomical...

Lorentz contraction

(Encyclopedia)Lorentz contraction lôrˈĕnts [key], in physics, contraction or foreshortening of a moving body in the direction of its motion, proposed by H. A. Lorentz on theoretical grounds and based on an earli...

ecliptic

(Encyclopedia)ecliptic ēklĭpˈtĭk, ĭ– [key], the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution a...

monetary agreement

(Encyclopedia)monetary agreement, attempt by two (bilateral) or more (multilateral) nations to regulate and coordinate their financial relations by treaty. The objectives are usually to promote trade by facilitatin...

latitude

(Encyclopedia)latitude, angular distance of any point on the surface of the earth north or south of the equator. The equator is latitude 0°, and the North Pole and South Pole are latitudes 90°N and 90°S, respect...

Río Muni

(Encyclopedia)Río Muni: see Equatorial Guinea. ...

Spanish Guinea

(Encyclopedia)Spanish Guinea: see Equatorial Guinea. ...

Santa Isabel

(Encyclopedia)Santa Isabel: see Malabo, Equatorial Guinea. ...

Fernando Po

(Encyclopedia)Fernando Po or Fernando Póo: see Equatorial Guinea. ...