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	Term	术语	Definition	定义
	pluviograph	（自计）雨量计	RAIN GAUGE which includes an arrangement for the time recording of the depth of water from PRECIPITATION.	装备按时记录降水水深装置的测雨计。
	pocket compass	袖珍罗经	See COMPASS.	一种轻便罗经（用于岸线测量或勘测中）。
	Poincaré wave	庞加勒波	A long period gravity wave. The superposition of incident and reflected plane waves (Sverdrup Waves) such that the composite wave fronts a... more A long period gravity wave. The superposition of incident and reflected plane waves (Sverdrup Waves) such that the composite wave fronts are perpendicular to the coast with a set of nodal lines normal to the wave fronts. The term is used in tidal analysis to study ocean tides and tides in open seas and gulfs.	一种长周期重力波。入射和反射平面波相叠加，当一组波节线垂直于锋时，而产生的波锋与海岸相垂直。�... more 一种长周期重力波。入射和反射平面波相叠加，当一组波节线垂直于锋时，而产生的波锋与海岸相垂直。本术语用于研究海洋、开阔海面和港湾的潮汐分析。
	point	刻点，罗经点；小岬，尖端	One thirty-second of a circle, or 11 1/4 DEGREES. Also called COMPASS POINT when used in reference to COMPASS directions. The extreme en... more One thirty-second of a circle, or 11 1/4 DEGREES. Also called COMPASS POINT when used in reference to COMPASS directions. The extreme end of a CAPE; or the outer end of any land area protruding into the water, usually less prominent than a CAPE. In digital cartography, the 0-dimensional geometric primitive of an object that specifies location.	度盘上圆周的1/32，或11.25°。在用于罗经指向时，亦称罗经方位点。海角的端点；伸向水中的陆地外端，�... more 度盘上圆周的1/32，或11.25°。在用于罗经指向时，亦称罗经方位点。海角的端点；伸向水中的陆地外端，通常比海角突起的程度低。在数字制图中，指用于标明某个物标位置的0维地理原点。
	pointing line	瞄准线	See COLLIMATION: LINE OF.	参见line of collimation（视准轴）。
	point of Aries	平分点	See EQUINOX.	参见equinox（二分点）。
	point of arrival	到达点	See ARRIVAL: POINT OF.	参见point of arrival（到达点）。
	point of destination	到达点	See DESTINATION: POINT OF.	参见point of destination（到达点）。
	point of origin	（坐标）原点	See COORDINATES: ORIGIN OF.	参见origin of coordinates（坐标原点）。
	point of symmetry	对称点	The point in the FOCAL PLANE of a CAMERA about which all lens DISTORTIONS are symmetrical. If the LENS were perfectly mounted, the point o... more The point in the FOCAL PLANE of a CAMERA about which all lens DISTORTIONS are symmetrical. If the LENS were perfectly mounted, the point of symmetry would coincide with the PRINCIPAL POINT.	照相机焦面上的点。相对于该点，所有透镜畸变都是对称的。如果该透镜安装完善，该对称点应与像主点�... more 照相机焦面上的点。相对于该点，所有透镜畸变都是对称的。如果该透镜安装完善，该对称点应与像主点相重合。
	polar aurora	极（曙）光	See AURORA.	参见aurora（极光）。
	polar axis	极轴	See AXIS.	极坐标或球面坐标系中的主方向轴。
	polar bearing	极方位角	See BEARING.	在极坐标系或球面坐标系中，由基准子午面与过所求点的子午面相交所形成的夹角。
	polar chart	极地海图，极投影海图	See CHART.	极地区域的海图，或采用极投影的海图。
	polar circle	极圈	Either the ARCTIC CIRCLE (north polar circle) or the ANTARCTIC CIRCLE (south polar circle).	南极圈或北极圈。
	polar coordinates	极坐标	See COORDINATES.	一种描述空间点位的坐标系统。它以任意选定的原点为基准，用两个方向和一个距离来确定点位，即两个�... more 一种描述空间点位的坐标系统。它以任意选定的原点为基准，用两个方向和一个距离来确定点位，即两个矢量角和一个矢径值。
	polar distance	极距	ANGULAR DISTANCE from a CELESTIAL POLE; the arc of an HOUR CIRCLE between a CELESTIAL POLE, usually the ELEVATED POLE, and a point on the CE... more ANGULAR DISTANCE from a CELESTIAL POLE; the arc of an HOUR CIRCLE between a CELESTIAL POLE, usually the ELEVATED POLE, and a point on the CELESTIAL SPHERE, measured from the CELESTIAL POLE through 180°. When the DECLINATION and LATITUDE are of the same name, CODECLINATION is the same as polar distance measured from the ELEVATED POLE.	从天极起算的角距离；天极通常是上天极与天球上某点之间的时圈弧（从天极起算量到180°）。当赤纬与纬... more 从天极起算的角距离；天极通常是上天极与天球上某点之间的时圈弧（从天极起算量到180°）。当赤纬与纬度同名时，余赤纬与从天极测得的极距相同。
	polar front	极锋	Quasi-permanent FRONT of great extent, of middle latitudes, which separates relatively cold polar air and relatively warm tropical air, and ... more Quasi-permanent FRONT of great extent, of middle latitudes, which separates relatively cold polar air and relatively warm tropical air, and on which WAVES are produced.	在中纬度上极大的准永久锋面，该锋面将较冷的极气团与较暖的热带气团隔开，在该锋面上产生波浪。
	polar ice	极地冰	SEA ICE that is more than one year old (in contrast to WINTER ICE). The WMO code defines polar ice as any SEA ICE more than one year old and... more SEA ICE that is more than one year old (in contrast to WINTER ICE). The WMO code defines polar ice as any SEA ICE more than one year old and more than 3 metres thick.	多年（相对于初冬冰）的海冰。世界气象组织（WMO）将极地冰定义为1年以上、厚度超过3米的海冰。
	Polaris correction	北极星改正	A CORRECTION to be applied to the OBSERVED ALTITUDE of Polaris to obtain the LATITUDE.	为了获得纬度而加在北极星观测高度上的改正量。
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