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Eng ID | Term | Definition |
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2301 | horizon: sensible | That circle of the CELESTIAL SPHERE formed by the intersection of the CELESTIAL SPHERE and a plane through any point, such as the eye of an... more |
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2302 | horizon: true | In PHOTOGRAMMETRY, a horizontal plane passing through a point of vision or PERSPECTIVE CENTRE. The APPARENT HORIZON approximates the true ... more |
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2303 | horizon: visible (or local) | See HORIZON: APPARENT. |
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2304 | horizon glass | That glass of a MARINE SEXTANT, attached to the frame, through which the HORIZON is observed. That half of this glass nearer the frame is s... more |
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2305 | horizon line | See HORIZON TRACE. |
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2306 | horizon mirror | The mirror part of the HORIZON GLASS. The expression is sometimes used somewhat loosely to refer to the HORIZON GLASS. |
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2307 | horizon photograph | In AERIAL PHOTOGRAPHY, a PHOTOGRAPH of the HORIZON, taken simultaneously with a VERTICAL PHOTOGRAPH and used to determine the RELATIVE TILT... more |
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2308 | horizon shade | One of the pivoted coloured glasses which can be swung before the HORIZON GLASS of a SEXTANT to regulate the intensity of light. |
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2309 | horizon system of coordinates | A set of CELESTIAL COORDINATES based on the CELESTIAL HORIZON as the PRIMARY GREAT CIRCLE; usually ALTITUDE and AZIMUTH or AZIMUTH ANGLE. |
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2310 | horizontal | (adj). Parallel to the plane of the HORIZON; perpendicular to the DIRECTION OF GRAVITY. |
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2311 | horizontal axis | See AXIS. |
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2312 | horizontal circle | See CIRCLE. |
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2313 | horizontal control | See CONTROL. |
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2314 | horizontal control datum | The position on the SPHEROID OF REFERENCE assigned to the HORIZONTAL CONTROL (TRIANGULATION and TRAVERSE) of an area and defined by (1) th... more |
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2315 | horizontal coplane | See COPLANE: BASAL. |
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2316 | horizontal dilution of precision (HDOP) | See DILUTION OF PRECISION. |
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2317 | horizontal force instrument | See VIBRATING NEEDLE. |
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2318 | horizontal intensity of the earth's magnetic field | The strength of the horizontal component of the EARTH'S MAGNETIC FIELD. |
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2319 | horizontal parallax | See PARALLAX. |
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2320 | horizontal photograph | See PHOTOGRAPH. |