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	Eng ID	Term	Definition
	781	choppy sea	The state of the sea caused by interaction of waves running in different directions.
	782	chromatic aberration	See ABERRATION OF LIGHT.
	783	chromatism	See ABERRATION OF LIGHT.
	784	chromosphere	The reddish LAYER of incandescent gases around the SUN, visible at a TOTAL ECLIPSE. A similar LAYER surrounding a STAR.
	785	chronograph	An instrument for measuring and recording TIME or time intervals.
	786	chronometer	A portable timekeeper with a compensated balance, capable of showing TIME with extreme PRECISION and ACCURACY.
	787	chronometer: sidereal	A CHRONOMETER that indicates SIDEREAL TIME at a given place, or that corresponding to a given MERIDIAN.
	788	chronometer: standard	The CHRONOMETER with which the others aboard a vessel are compared and to which all OBSERVATIONS involving TIME are referred.
	789	chronometer correction	The amount to be added algebraically to the TIME of the CHRONOMETER to obtain the correct TIME.
	790	chronometer rate	The amount gained or lost by a CHRONOMETER in a unit of TIME. It is usually expressed in SECONDS per 24 HOURS, and is sometimes called daily... more The amount gained or lost by a CHRONOMETER in a unit of TIME. It is usually expressed in SECONDS per 24 HOURS, and is sometimes called daily rate.
	791	chronometric method	A former method of determining LONGITUDE by transporting CHRONOMETERS between STATIONS whose DIFFERENCE OF LONGITUDE was to be determined.
	792	cinders	Fragments formed when MAGMA is blown into the air; larger in size than VOLCANIC ASH. Cinders are a constituent of certain marine sediments.
	793	circle	In a surveying instrument, the graduated disk which is perpendicular to and centered about an AXIS of ROTATION and is calibrated to read the... more In a surveying instrument, the graduated disk which is perpendicular to and centered about an AXIS of ROTATION and is calibrated to read the amount of ROTATION.
	794	circle: dip	See DIP CIRCLE.
	795	circle: fundamental	See PRIMARY GREAT CIRCLE.
	796	circle: great	The intersection of a sphere and a plane through its center. See also ORTHODROME.
	797	circle: horizontal	In a surveying instrument, the graduated CIRCLE used for measuring horizontal angles.
	798	circle: hydrographic	A double-reflecting instrument intended primarily for use in HYDROGRAPHIC SURVEY; enables measurement of angles up to 180°. See also SEXTANT... more A double-reflecting instrument intended primarily for use in HYDROGRAPHIC SURVEY; enables measurement of angles up to 180°. See also SEXTANT: SOUNDING.
	799	circle: small	The intersection of a sphere and a plane which does not pass through its center.
	800	circle: vertical	A GREAT CIRCLE on the CELESTIAL SPHERE passing through the ZENITH and NADIR. Vertical circles are perpendicular to the HORIZON. In a survey... more A GREAT CIRCLE on the CELESTIAL SPHERE passing through the ZENITH and NADIR. Vertical circles are perpendicular to the HORIZON. In a surveying instrument, the graduated CIRCLE used for measuring vertical angles.
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