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	Eng ID	Term	Definition
	1421	distortion: lens	See DISTORTION.
	1422	distortion: radial	A lens aberration that is corrected on the PHOTOGRAPH by displacing the IMAGE along a radial line from the PRINCIPAL POINT.
	1423	distortion of medium	Changes in the dimensions of SURVEYS or CHARTS due to expansion or contraction of the paper on which the SURVEY or CHART is drawn or printed... more Changes in the dimensions of SURVEYS or CHARTS due to expansion or contraction of the paper on which the SURVEY or CHART is drawn or printed. See also DIFFERENTIAL SHRINKAGE.
	1424	distributary	A river branch which flows away from the main STREAM without returning to it, as in a DELTA.
	1425	diurnal aberration	See ABERRATION OF LIGHT.
	1426	diurnal arc	See ARC: ASTRONOMICAL.
	1427	diurnal current	See CURRENT.
	1428	diurnal inequality	The difference between the HEIGHTS of the two HIGH TIDES (high water inequality) or the two LOW TIDES (low water inequality) during a TIDAL ... more The difference between the HEIGHTS of the two HIGH TIDES (high water inequality) or the two LOW TIDES (low water inequality) during a TIDAL DAY, or the difference in SPEED between the two FLOOD or the two EBB CURRENTS during a TIDAL DAY. The average diurnal inequality is called tropic high water inequality and tropic low water inequality when referred to the HIGH WATERS and LOW WATERS, respectively, of TROPIC TIDES. Mean diurnal high water inequality is half the average difference between the HEIGHTS of the two HIGH WATERS of each TIDAL DAY over a 19-year period. Mean diurnal low water inequality is half the average difference between the HEIGHTS of the two LOW WATERS for a similar period. Also called declinational inequality.
	1429	diurnal motion	The apparent daily motion of a celestial body.
	1430	diurnal parallax	See PARALLAX.
	1431	diurnal range	See RANGE.
	1432	diurnal tide	See TIDE.
	1433	diver	A person skilled in the practice of diving.
	1434	divergence	In OCEANOGRAPHY, a horizontal FLOW of water, in different directions, from a common centre or zone; often associated with UPWELLING.
	1435	divider(s)	Measuring COMPASSES having both legs pointed, used principally for measuring distances and COORDINATES.
	1436	dock	The space between two piers. Also called a SLIP.
	1437	dock: dry	An artificial BASIN fitted with a gate or CAISSON, into which vessels can be floated and the water pumped out to expose the vessel's bottom.... more An artificial BASIN fitted with a gate or CAISSON, into which vessels can be floated and the water pumped out to expose the vessel's bottom. Also called graving dock.
	1438	dock: floating	A form of DRY DOCK consisting of a floating structure of one or more sections which can be partly submerged by controlled flooding to receiv... more A form of DRY DOCK consisting of a floating structure of one or more sections which can be partly submerged by controlled flooding to receive a vessel, then raised by pumping out the water so that the vessel's bottom can be exposed.
	1439	dock: graving	See DOCK: DRY.
	1440	dock: wet	A DOCK in which water can be maintained at any level by closing a gate when the water is at the desired level.
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