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	Term	术语	Definition	定义
	horizon: sensible	可见地平	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 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.	过任一点（如观测者的眼睛），并垂直于天顶/天底线的平面与天球相截而形成的大圈。
	horizon: true	真地平	In PHOTOGRAMMETRY, a horizontal plane passing through a point of vision or PERSPECTIVE CENTRE. The APPARENT HORIZON approximates the true ... 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.	在摄影测量学中，过视点或透视中心的地平面。当视点非常接近海平面时，视地平与真地平近似。
	horizon: visible (or local)	NULL	See HORIZON: APPARENT.	NULL
	horizon glass	地平镜，水平镜，定镜	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 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.	安装在航海六分仪框架上的玻璃镜子，通过它可观测到地平。靠近框架的一半镀银，成为反射天体影像的地平镜；另一半是透明的。
	horizon line	地平线	See HORIZON TRACE.	参见horizon trace（地平迹线）。
	horizon mirror	地平镜反射镜面	The mirror part of the HORIZON GLASS. The expression is sometimes used somewhat loosely to refer to the HORIZON GLASS.	地平镜的反射镜面部分。不太严格时用来指地平镜。
	horizon photograph	地平像片，地平摄影	In AERIAL PHOTOGRAPHY, a PHOTOGRAPH of the HORIZON, taken simultaneously with a VERTICAL PHOTOGRAPH and used to determine the RELATIVE TILT... 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.	在航空摄影测量中，在垂直摄影的同时进行的地平摄影，用来测定相邻垂直像片的相对倾斜。
	horizon shade	调色镜	One of the pivoted coloured glasses which can be swung before the HORIZON GLASS of a SEXTANT to regulate the intensity of light.	在六分仪地平镜前能转动的调整光强度的有色玻璃镜组中的一个。
	horizon system of coordinates	地平坐标系	A set of CELESTIAL COORDINATES based on the CELESTIAL HORIZON as the PRIMARY GREAT CIRCLE; usually ALTITUDE and AZIMUTH or AZIMUTH ANGLE.	以天文地平面作为基准大圆的天球坐标系；通常为地平纬度和方位或者方位角。
	horizontal	水平的	(adj). Parallel to the plane of the HORIZON; perpendicular to the DIRECTION OF GRAVITY.	（形容词）。平行于水平面的；垂直于重力方向。
	horizontal axis	水平轴	See AXIS.	在经纬仪或子午仪中，仪器望远镜垂直旋转的轴。也称为trunnion axis 或transit axis。
	horizontal circle	水平度盘	See CIRCLE.	在某一测量仪器中，用于测量水平角的刻度盘。
	horizontal control	平面控制	See CONTROL.	在平面位置中确定的控制。该平面控制可能适用于任何认可的地理或者平面坐标系统。
	horizontal control datum	平面控制基准	The position on the SPHEROID OF REFERENCE assigned to the HORIZONTAL CONTROL (TRIANGULATION and TRAVERSE) of an area and defined by (1) th... 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.	指一个区域平面控制测量（三角测量和导线测量）中位于参考椭球体的位置点，该位置由下列元素确定：（1）区域内一个选用站的位置（经度和纬度）（2）从选用站到邻站的方位角。亦可参见geodetic datum（大地基准面）。
	horizontal coplane	像对共面	See COPLANE: BASAL.	参见basal coplane（像对共面）。
	horizontal dilution of precision (HDOP)	平面误差放大因子、水平精度因子	See DILUTION OF PRECISION.	（HDOP）。参见dilution of precision（误差放大因子）。
	horizontal force instrument	水平力仪	See VIBRATING NEEDLE.	参见vibrating needle（摆动磁针仪）。
	horizontal intensity of the earth's magnetic field	地球磁场水平强度	The strength of the horizontal component of the EARTH'S MAGNETIC FIELD.	地球磁场水平分量的强度。
	horizontal parallax	水平视差	See PARALLAX.	在天文学中，指在观测者地平线上某一天体的地心视差。在摄影测量学中指绝对立体视差。
	horizontal photograph	水平像片	See PHOTOGRAPH.	照相机光轴水平时拍摄的像片。
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