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equator

(Encyclopedia)equator, imaginary great circle around the earth, everywhere equidistant from the two geographical poles and forming the base line from which latitude is reckoned. The equator, which measures c.24,902...

Equatorial Guinea

(Encyclopedia)CE5 Equatorial Guinea gĭnˈē [key], officially Republic of Equatorial Guinea, republic (2021 est. pop. ...

Equatorial Islands

(Encyclopedia)Equatorial Islands: see Line Islands. ...

equatorial mounting

(Encyclopedia)equatorial mounting: see telescope. ...

hour circle

(Encyclopedia)hour circle, in astronomy, a secondary axis in the equatorial coordinate system. The hour circle of a celestial body is the great circle on the celestial sphere that passes through both the body and t...

celestial pole

(Encyclopedia)celestial pole, one of the two points at which the earth's axis of rotation intersects the celestial sphere. The celestial pole is important as a reference point in the equatorial coordinate system; t...

solar system

(Encyclopedia)CE5 Solar system CE5 solar system, the sun and the surrounding planets, natural satellites, dwarf planets, asteroids, meteoroids, and comets that are bound by its gravity. The sun is by far the ...

French Equatorial Africa

(Encyclopedia)French Equatorial Africa, former French federation in W central Africa. It consisted of four constituent territories: Gabon, Middle Congo (see Congo, Republic of the), Chad, and Ubangi-Shari (now the ...

nervous system

(Encyclopedia)CE5 Nerve cell CE5 Nervous system nervous system, network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of ...

azimuth

(Encyclopedia)azimuth ăzˈəməth [key], in astronomy, one coordinate in the altazimuth coordinate system. It is the angular distance of a body measured westward along the celestial horizon from the observer's sou...