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	Eng ID	Term	Definition
	3501	north: magnetic	The direction indicated by the north seeking POLE of a freely suspended MAGNETIC NEEDLE influenced only by the EARTH's MAGNETIC FIELD.
	3502	north: true	The DIRECTION of the north GEOGRAPHIC POLE.
	3503	north celestial pole	See POLE: CELESTIAL.
	3504	north geographical pole	See POLE: GEOGRAPHICAL.
	3505	northing	The distance a craft makes good to the north. The opposite is SOUTHING. In a cartesian reference system the value of one coordinate, usually... more The distance a craft makes good to the north. The opposite is SOUTHING. In a cartesian reference system the value of one coordinate, usually expressed in metres, measured from the origin in north-south direction; used e.g. in the UTM system.
	3506	north magnetic pole	See MAGNETIC POLE.
	3507	notch (or gap)	A narrow passage between two ELEVATIONS, as MOUNTAINS; a deep close PASS; a DEFILE.
	3508	Notice to Mariners	A periodical or casual notice issued by hydrographic offices, or other competent authorities, regarding changes in AIDS TO NAVIGATION, dan... more A periodical or casual notice issued by hydrographic offices, or other competent authorities, regarding changes in AIDS TO NAVIGATION, dangers to NAVIGATION, important new SOUNDINGS, and, in general, all such information as affects NAUTICAL CHARTS, SAILING DIRECTIONS, LIGHT LISTS and other nautical publications.
	3509	nuclear precession magnetometer	See MAGNETOMETER.
	3510	numerical scale	See SCALE: NATURAL.
	3511	nunatak	An isolated hill or mountain peak of rock projecting above an INLAND ICE SHEET.
	3512	nun buoy	A BUOY the above water part of which is in the shape of a cone or a truncated cone.
	3513	nutation	Irregularities in the precessional motion of the EQUINOXES because of varying positions of the MOON, and, to a lesser extent, of other CELES... more Irregularities in the precessional motion of the EQUINOXES because of varying positions of the MOON, and, to a lesser extent, of other CELESTIAL BODIES, with respect to the ECLIPTIC. Because of nutation the EARTH's AXIS nods like a top, describing an irregular circle about the mean pole in a period of about 19 years.
	3514	Nyquist frequency	The highest frequency that may be uniquely resolved in a time series from a given sampling interval. The Nyquist frequency is equal to twi... more The highest frequency that may be uniquely resolved in a time series from a given sampling interval. The Nyquist frequency is equal to twice the sampling interval. Analyzing frequencies for which the Nyquist criterion is not met leads to ALIASING.
	3515	object-glass	See OBJECTIVE LENS.
	3516	objective	See OBJECTIVE LENS.
	3517	objective lens	In TELESCOPES and microscopes,the optical component which receives light from the object and forms the first or primary IMAGE. In a CAMERA, ... more In TELESCOPES and microscopes,the optical component which receives light from the object and forms the first or primary IMAGE. In a CAMERA, the IMAGE formed by the objective lens is the final IMAGE. In a TELESCOPE or microscope used visually, the IMAGE formed by the objective lens is magnified by the EYEPIECE. Also called objective or object-glass.
	3518	oblate spheroid	See SPHEROID.
	3519	oblique photograph	See PHOTOGRAPH.
	3520	oblique plotting instrument	An instrument (usually monocular) for plotting from OBLIQUE PHOTOGRAPHS.
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