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	Eng ID	Term	Definition
	681	celestial globe	See STAR GLOBE.
	682	celestial horizon	See HORIZON.
	683	celestial latitude	See LATITUDE.
	684	celestial line of position	A LINE OF POSITION determined by means of one CELESTIAL BODY.
	685	celestial longitude	See LONGITUDE.
	686	celestial meridian	See MERIDIAN.
	687	celestial navigation	See NAVIGATION.
	688	celestial pole	See POLE.
	689	celestial sphere	An imaginary sphere of infinite radius, concentric with the EARTH, on which CELESTIAL BODIES are imagined to be projected. Also called celes... more An imaginary sphere of infinite radius, concentric with the EARTH, on which CELESTIAL BODIES are imagined to be projected. Also called celestial concave.
	690	cellular wave	See WAVE.
	691	Celsius temperature scale	A thermodynamic scale of temperature (t°C) defined as a function of the KELVIN TEMPERATURE SCALE (T°K) by the relationship t°C = T°K 273.15.... more A thermodynamic scale of temperature (t°C) defined as a function of the KELVIN TEMPERATURE SCALE (T°K) by the relationship t°C = T°K 273.15. Name for Anders Celsius (1701-44), Swedish astronomer who first described, in 1742, the centigrade temperature scale. NOTE. According to a resolution of the Ninth International Conference on Weights and Measures (1948), temperature should be designated 'degrees Celsius' and the designation 'degrees centigrade' should be discontinued.
	692	centering (or centring)	The placing of an instrument with its VERTICAL AXIS in the VERTICAL through the ground mark. The setting of LENSES of an optical instrument... more The placing of an instrument with its VERTICAL AXIS in the VERTICAL through the ground mark. The setting of LENSES of an optical instrument in such a manner that their OPTICAL AXES are in the same straight line.
	693	centigrade temperature scale	See CELSIUS TEMPERATURE SCALE.
	694	centimetre-gram-second (CGS) system	The system of physical units in which the fundamental units of length, mass and TIME are the centimetre, GRAM and SECOND, respectively.
	695	central meridian	See MERIDIAN: INITIAL.
	696	central processing unit (CPU)	In computers in general the unit that comprises the arithmetic logic unit and the control unit.
	697	centre: reduction to	See REDUCTION.
	698	centre of buoyancy	See BUOYANCY.
	699	centre of gravity	See GRAVITY.
	700	centrifugal force	The force with which a body moving under constraint along a curved PATH reacts to the constraint. Equal and opposite to the CENTRIPETAL FORC... more The force with which a body moving under constraint along a curved PATH reacts to the constraint. Equal and opposite to the CENTRIPETAL FORCE.
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