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	Eng ID	Term	Definition
	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 a... more 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 observer, and perpendicular to the zenith-nadir line.
	2302	horizon: true	In PHOTOGRAMMETRY, a horizontal plane passing through a point of vision or PERSPECTIVE CENTRE. The APPARENT HORIZON approximates the tru... more In PHOTOGRAMMETRY, a horizontal plane passing through a point of vision or PERSPECTIVE CENTRE. The APPARENT HORIZON approximates the true horizon only when the point of vision is very close to SEA LEVEL.
	2303	horizon: visible (or local)	See HORIZON: APPARENT.
	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 ... more 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 silvered to form the HORIZON MIRROR for reflecting the IMAGE of a CELESTIAL BODY; the other half is clear.
	2305	horizon line	See HORIZON TRACE.
	2306	horizon mirror	The mirror part of the HORIZON GLASS. The expression is sometimes used somewhat loosely to refer to the HORIZON GLASS.
	2307	horizon photograph	In AERIAL PHOTOGRAPHY, a PHOTOGRAPH of the HORIZON, taken simultaneously with a VERTICAL PHOTOGRAPH and used to determine the RELATIVE TIL... more In AERIAL PHOTOGRAPHY, a PHOTOGRAPH of the HORIZON, taken simultaneously with a VERTICAL PHOTOGRAPH and used to determine the RELATIVE TILT between adjacent VERTICAL PHOTOGRAPHS.
	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.
	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.
	2310	horizontal	(adj). Parallel to the plane of the HORIZON; perpendicular to the DIRECTION OF GRAVITY.
	2311	horizontal axis	See AXIS.
	2312	horizontal circle	See CIRCLE.
	2313	horizontal control	See CONTROL.
	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) ... more The position on the SPHEROID OF REFERENCE assigned to the HORIZONTAL CONTROL (TRIANGULATION and TRAVERSE) of an area and defined by (1) the POSITION (LATITUDE and LONGITUDE) of one selected STATION in the area, and (2) the AZIMUTH from the selected STATION to an adjoining STATION. See also DATUM: GEODETIC.
	2315	horizontal coplane	See COPLANE: BASAL.
	2316	horizontal dilution of precision (HDOP)	See DILUTION OF PRECISION.
	2317	horizontal force instrument	See VIBRATING NEEDLE.
	2318	horizontal intensity of the earth's magnetic field	The strength of the horizontal component of the EARTH'S MAGNETIC FIELD.
	2319	horizontal parallax	See PARALLAX.
	2320	horizontal photograph	See PHOTOGRAPH.
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