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Eng ID | Term | Definition |
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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. |
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3502 | north: true | The DIRECTION of the north GEOGRAPHIC POLE. |
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3503 | north celestial pole | See POLE: CELESTIAL. |
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3504 | north geographical pole | See POLE: GEOGRAPHICAL. |
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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 |
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3506 | north magnetic pole | See MAGNETIC POLE. |
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3507 | notch (or gap) | A narrow passage between two ELEVATIONS, as MOUNTAINS; a deep close PASS; a DEFILE. |
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3508 | Notice to Mariners | A periodical or casual notice issued by hydrographic offices, or other competent authorities, regarding changes in AIDS TO NAVIGATION, dang... more |
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3509 | nuclear precession magnetometer | See MAGNETOMETER. |
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3510 | numerical scale | See SCALE: NATURAL. |
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3511 | nunatak | An isolated hill or mountain peak of rock projecting above an INLAND ICE SHEET. |
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3512 | nun buoy | A BUOY the above water part of which is in the shape of a cone or a truncated cone. |
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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 |
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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 twic... more |
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3515 | object-glass | See OBJECTIVE LENS. |
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3516 | objective | See OBJECTIVE LENS. |
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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 |
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3518 | oblate spheroid | See SPHEROID. |
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3519 | oblique photograph | See PHOTOGRAPH. |
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3520 | oblique plotting instrument | An instrument (usually monocular) for plotting from OBLIQUE PHOTOGRAPHS. |