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	Term	术语	Definition	定义
	parallax correction	视差改正	A CORRECTION due to PARALLAX, particularly that SEXTANT ALTITUDE correction due to the difference between the apparent direction from a poin... more A CORRECTION due to PARALLAX, particularly that SEXTANT ALTITUDE correction due to the difference between the apparent direction from a point on the surface of the EARTH to a CELESTIAL BODY and the apparent direction from the centre of the EARTH to the same body.	对视差所作的改正，尤指对从地球表面某点到某天体的视向与从地球中心到同一天体的视向之间差所进行的六分仪高度改正。
	parallax difference	视差差数	In PHOTOGRAMMETRY, the difference in the ABSOLUTE STEREOSCOPIC PARALLAXES of two points imaged on a pair of PHOTOGRAPHS. Customarily used i... more In PHOTOGRAMMETRY, the difference in the ABSOLUTE STEREOSCOPIC PARALLAXES of two points imaged on a pair of PHOTOGRAPHS. Customarily used in determination of the difference in ELEVATIONS of objects.	在摄影测量学中，指像对上两个像点的绝对立体视差的差。通常用于确定物体的高差。
	parallax in altitude	（天体）高度视差	GEOCENTRIC PARALLAX of a body at any ALTITUDE. The expression is used to distinguish the PARALLAX at the given ALTITUDE from the HORIZONTAL ... more GEOCENTRIC PARALLAX of a body at any ALTITUDE. The expression is used to distinguish the PARALLAX at the given ALTITUDE from the HORIZONTAL PARALLAX when the body is in the HORIZON.	在任意地平纬度上天体的地心视差。该词用于区别特定地平纬度上的视差与当天体位于地平线时的地平视差。
	parallax inequality	（潮汐）视差不等	The variation in the RANGE OF TIDE or in the SPEED of TIDAL CURRENTS due to the continual change in the distance of the MOON from the EARTH.	由月球和地球之间的距离不断变化而引起的潮差或潮流速度的变化。
	parallel	纬圈	A circle (or approximation of a circle) on the surface of the EARTH, parallel to the EQUATOR and connecting points of equal LATITUDE. Also c... more A circle (or approximation of a circle) on the surface of the EARTH, parallel to the EQUATOR and connecting points of equal LATITUDE. Also called parallel of latitude.	地球表面相同纬度的各点连线形成的平行于赤道的圆圈或近似圆圈。亦称parallel of latitude（黄纬圈）。
	parallel: astronomical	NULL	A line on the surface of the EARTH which has the same ASTRONOMICAL LATITUDE at every point. Because the DEFLECTION OF THE VERTICAL is not th... more A line on the surface of the EARTH which has the same ASTRONOMICAL LATITUDE at every point. Because the DEFLECTION OF THE VERTICAL is not the same at all points on the EARTH, an astronomical parallel is an irregular line, not lying in a single plane.	NULL
	parallel: celestial	天球纬圈，赤纬圈	See PARALLEL OF DECLINATION.	参见parallel of declination（赤纬圈）。
	parallel: geodetic	大地纬圈	A line on the SPHEROID which has the same GEODETIC LATITUDE at every point. A geodetic parallel, other than the EQUATOR, is not a GEODETIC L... more A line on the SPHEROID which has the same GEODETIC LATITUDE at every point. A geodetic parallel, other than the EQUATOR, is not a GEODETIC LINE. In form, it is a SMALL CIRCLE whose plane is parallel with the plane of the GEODETIC EQUATOR.	在旋转球体上，线上各点具有相同大地纬度的一条线。大地纬圈不同于赤道，它不是大地线。在形式上，它只是一个小圆，它的平面与大地赤道平面平行。
	parallel: geographic(al)	地理纬圈	A line on the EARTH having the same LATITUDE at every point. The term is applicable alike to an ASTRONOMICAL PARALLEL or to a GEODETIC PAR... more A line on the EARTH having the same LATITUDE at every point. The term is applicable alike to an ASTRONOMICAL PARALLEL or to a GEODETIC PARALLEL.	在地球上其各点具有相同纬度的一条线。该词可以与天文纬圈和大地纬圈通用。
	parallel: ground	地横线	In PHOTOGRAMMETRY, the intersection of the plane of the PHOTOGRAPH with the plane of reference of the GROUND. See also AXIS OF HOMOLOGY.	在摄影测量学中指摄影平面与地面参考平面之间的交线。亦可参见axis of homology（透射轴）。
	parallel: isometric	等比线；等量纬圈	In PHOTOGRAMMETRY, the intersecting line between the plane of a PHOTOGRAPH and a horizontal plane having an equal perpendicular distance ... more In PHOTOGRAMMETRY, the intersecting line between the plane of a PHOTOGRAPH and a horizontal plane having an equal perpendicular distance from the same PERSPECTIVE CENTRE.	在摄影测量学中，指像片平面与到相同透视中心具有相同垂直距离的水平面的交线。
	parallel: photograph	像横线	In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH of any horizontal line in the object space which is perpendicular to the PRINCIPAL PLANE. All p... more In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH of any horizontal line in the object space which is perpendicular to the PRINCIPAL PLANE. All photograph parallels are perpendicular to the PRINCIPAL LINE. The photograph parallel passing through the PRINCIPAL POINT is the principal parallel and that passing through the ISOCENTRE is the ISOMETRIC PARALLEL.	在摄影测量学中，指在垂直于主平面的对象空间中的，任何地平线在航摄像片上的影像。所有像片水平线均与像片主纵线相垂直。通过像主点的像片水平线是主横线，通过等角点的像片水平线是等比线。
	parallel: principal	主横线	See PARALLEL: PHOTOGRAPH.	参见photograph parallel（像横线）。
	parallel: standard	标准纬线	A PARALLEL of latitude which is used as a control in the computation of a map PROJECTION. For a tangent cone, this is the PARALLEL of tangen... more A PARALLEL of latitude which is used as a control in the computation of a map PROJECTION. For a tangent cone, this is the PARALLEL of tangency. For a secant cone, the two PARALLELS of intersection are the standards.	一种用于控制地图投影计算的纬度线。对于切圆锥体而言，它即为标准纬线。对于正割圆锥而言，相割的两条纬线均为标准纬线。
	parallel motion protractor	平行运动分度规	See PROTRACTOR.	以一个量角器为基础的仪器，其一个或多个臂与平行运动装置相连接，因此向任何方向移动这些臂，均是做平行运动。该量角器可旋转并安置在任何位置上，以便在图上定向。亦称universal drafting machine（全能绘图仪）。
	parallel of altitude	地平纬圈	See ALMUCANTAR.	参见almucantar（等高圈）。
	parallel of declination	赤纬圈	A circle of the CELESTIAL SPHERE parallel to the CELESTIAL EQUATOR. Also called celestial parallel.	平行于天球赤道的天球圈，亦称celestial parallel（天球纬圈）。
	parallel of latitude	黄经圈	See PARALLEL.	参见parallel（纬圈）。
	parallel plate	平行板；测量仪底盘	An optical disk with optically flat, parallel surfaces; used especially in optical MICROMETERS.	带有光学平晶、平行面的光具盘，用于光学测微器。
	parallel rulers (or rule)	平行规	An instrument for transferring a line parallel to itself.	平移线段的仪器。
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