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	Eng ID	Term	Definition
	3481	nodal point: incident	See NODAL POINT.
	3482	nodal point: rear	See NODAL POINT.
	3483	node	A point that is the start or end point of a line segment. In ASTRONOMY, one of the two points of intersection of the ORBIT of a PLANET, PLAN... more A point that is the start or end point of a line segment. In ASTRONOMY, one of the two points of intersection of the ORBIT of a PLANET, PLANETOID, or COMET with the ECLIPTIC, or of the ORBIT of a SATELLITE with the plane of the orbit of its primary. That point at which the body crosses to the north side of the reference plane is called the ascending node; the other, the descending node. The line connecting the nodes is called LINE OF NODES. Also called NODAL POINT. See REGRESSION OF THE NODES. In OCEANOGRAPHY, that part of a STANDING WAVE where the vertical motion is least and the horizontal VELOCITIES are greatest. See PARTIAL NODE. In optics, a NODAL POINT.
	3484	nodical month	See MONTH.
	3485	nodules	In OCEANOGRAPHY, concretionary lumps of manganese, cobalt, iron, and nickel found widely scattered on the ocean floor. ROCKS of various siz... more In OCEANOGRAPHY, concretionary lumps of manganese, cobalt, iron, and nickel found widely scattered on the ocean floor. ROCKS of various sizes and shapes often are encrusted with these metals.
	3486	noise	Any undesired SOUND. By extension, noise is any unwanted disturbance within a useful FREQUENCY BAND, such as undesired electric WAVES in a t... more Any undesired SOUND. By extension, noise is any unwanted disturbance within a useful FREQUENCY BAND, such as undesired electric WAVES in a transmission channel or device.
	3487	nominal range	See RANGE.
	3488	nomogram (or nomograph)	A DIAGRAM showing, to SCALE, the relationship between several variables in such manner that the value of one which corresponds to known valu... more A DIAGRAM showing, to SCALE, the relationship between several variables in such manner that the value of one which corresponds to known values of the others can be determined graphically. See CONVERSION SCALE, CONVERSION TABLE.
	3489	nonharmonic constants	Tidal or tidal current constants such as LUNITIDAL INTERVALS, ranges, and inequalities, which can be derived directly from OBSERVATION with... more Tidal or tidal current constants such as LUNITIDAL INTERVALS, ranges, and inequalities, which can be derived directly from OBSERVATION without regard to the HARMONIC CONSTITUENTS.
	3490	nonharmonic method	In TIDE PREDICTION, an approximate method based on the principle that 'the TIDE follows the MOON'. It makes use of the close relationship th... more In TIDE PREDICTION, an approximate method based on the principle that 'the TIDE follows the MOON'. It makes use of the close relationship that exists between the TIME of TIDE at most places and the MOON's MERIDIAN TRANSIT.
	3491	nontidal current	See CURRENT.
	3492	noon	The instant at which a time reference is over the UPPER BRANCH of the reference MERIDIAN.
	3493	noon: apparent	Twelve o'clock APPARENT TIME.
	3494	noon: local apparent	Twelve o'clock LOCAL APPARENT TIME. Sometimes called high noon.
	3495	noon: mean	Twelve o'clock MEAN TIME.
	3496	normal	In general, a straight line perpendicular to a surface or to another line. In GEODESY, a straight line perpendicular to the surface of the S... more In general, a straight line perpendicular to a surface or to another line. In GEODESY, a straight line perpendicular to the surface of the SPHEROID.
	3497	normal equation	See EQUATION.
	3498	normal water	A standard SEA WATER preparation, the CHLORINITY of which lies between 19.30 and 19.50 per mille (0/00) and has been determined to within ± ... more A standard SEA WATER preparation, the CHLORINITY of which lies between 19.30 and 19.50 per mille (0/00) and has been determined to within ± 0.001 per mille. Normal water is used as a convenient comparison standard for chlorinity measurements of sea water samples by TITRATION. It is prepared by the Hydrographical Laboratories, Copenhagen, Denmark. Also called standard sea water.
	3499	north: compass	The direction north as indicated by a MAGNETIC COMPASS.
	3500	north: grid	An arbitrary REFERENCE DIRECTION used with GRID NAVIGATION. The northerly or zero direction indicated by the grid datum of directional refer... more An arbitrary REFERENCE DIRECTION used with GRID NAVIGATION. The northerly or zero direction indicated by the grid datum of directional reference.
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