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	Eng ID	Term	Definition
	841	clinometer	An instrument for indicating the degree of SLOPE or the angle of ROLL or PITCH of a vessel, according to the plane in which it is mounted.
	842	clock	Instrument for measuring TIME and recording HOURS.
	843	clock: atomic	A precision clock that depends for its operation on an electrical OSCILLATOR regulated by the natural vibrational FREQUENCY of an atomic sys... more A precision clock that depends for its operation on an electrical OSCILLATOR regulated by the natural vibrational FREQUENCY of an atomic system (such as a beam). The combination of two (or more) radionuclides whose activities can be utilized to ascertain time intervals.
	844	clock: cesium	An atomic clock using the properties of cesium.
	845	clock: crystal	A precision clock essentially consisting of a generator of constant FREQUENCY controlled by a resonator made of quartz crystal with suitable... more A precision clock essentially consisting of a generator of constant FREQUENCY controlled by a resonator made of quartz crystal with suitable methods for producing continuous ROTATION to operate time-indicating and related mechanisms. Also called quartz clock.
	846	clock: quartz	See CLOCK: CRYSTAL.
	847	closed traverse	See TRAVERSE.
	848	close pack ice	PACK ICE composed of FLOES mostly in contact, such that NAVIGATION becomes difficult even for specially constructed vessels. ICE CONCENTRATI... more PACK ICE composed of FLOES mostly in contact, such that NAVIGATION becomes difficult even for specially constructed vessels. ICE CONCENTRATION 7/10th to 9/10th.
	849	closing error	See ERROR OF CLOSURE.
	850	closing line	A line that divides the internal waters and territorial seas of a coastal State or the archipelagic waters of an archipelagic State.
	851	closing the horizon	See HORIZON.
	852	closure: error of	See ERROR OF CLOSURE.
	853	closure of triangle	See ERROR OF CLOSURE OF TRIANGLE.
	854	cloud	Visible aggregate of minute particles of liquid water or ICE, or of both together, in suspension in the ATMOSPHERE. This aggregate may inclu... more Visible aggregate of minute particles of liquid water or ICE, or of both together, in suspension in the ATMOSPHERE. This aggregate may include larger particles of liquid water or ICE, non-aqueous particles or solid particles, originating for example from industrial gases, smoke or DUST.
	855	cloud amount	The fraction of the sky covered by the CLOUDS of a certain genus, certain species, certain variety, certain layer, or of a certain combinati... more The fraction of the sky covered by the CLOUDS of a certain genus, certain species, certain variety, certain layer, or of a certain combination of CLOUDS. Also called partial cloud amount. See CLOUD GENERA.
	856	cloud classification	System of distinguishing and grouping CLOUDS according to one or more of the following criteria: a) appearance, b) process of formation, ... more System of distinguishing and grouping CLOUDS according to one or more of the following criteria: a) appearance, b) process of formation, c) common HEIGHT, d) particulate composition.
	857	cloud genera	Main characteristic mutually exclusive forms of CLOUDS, constituting the basis of the CLOUD CLASSIFICATION included in the International Clo... more Main characteristic mutually exclusive forms of CLOUDS, constituting the basis of the CLOUD CLASSIFICATION included in the International Cloud Atlas, 1956. The cloud genera are ten in number: cirrus, cirrocumulus, cirrostratus, altocumulus, altostratus, nimbostratus, stratocumulus, stratus, cumulus, cumulonimbus.
	858	clutter	Confused unwanted ECHOES on a radar display.
	859	coast	The edge or margin of the LAND next to the SEA; the SEASHORE. Sometimes defined as the meeting of the LAND and SEA considered as the BOUNDAR... more The edge or margin of the LAND next to the SEA; the SEASHORE. Sometimes defined as the meeting of the LAND and SEA considered as the BOUNDARY of the LAND.
	860	coast	(v.t.). To sail along or near a COAST.
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