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	Term	术语	Definition	定义
	obliquity of the ecliptic	黄赤交角	The acute angle between the plane of the ECLIPTIC and the plane of the CELESTIAL EQUATOR, about 23° 27'.	黄道面与天球赤道面间的锐角，约为23°27′。
	obscured	掩蔽的	(adj.). Said of the arc of a LIGHT SECTOR designated by its limiting BEARINGS in which the LIGHT is not visible from seaward.	（形容词）。对通过限定方位从而在海上无法看到灯光的导航灯扇面特定弧段的描述。
	observation	观测量（值）；观测	The act or practice of noting and recording facts and events as for some scientific study. The measure of a quantity whose value is desire... more The act or practice of noting and recording facts and events as for some scientific study. The measure of a quantity whose value is desired. The DATA so noted and recorded. A single measure, at a single setting of an apparatus.	在科学研究中，指对事件及现象进行观察和记录的行为或实践。对所需值的量进行测量。观察并记录下的�... more 在科学研究中，指对事件及现象进行观察和记录的行为或实践。对所需值的量进行测量。观察并记录下的数据。在仪器单一设置下进行的单项测量。
	observation(s): astronomical	NULL	OBSERVATIONS of CELESTIAL BODIES, with appropriate instruments. In NAVIGATION, the measurement of ALTITUDE and AZIMUTH of CELESTIAL BODIES... more OBSERVATIONS of CELESTIAL BODIES, with appropriate instruments. In NAVIGATION, the measurement of ALTITUDE and AZIMUTH of CELESTIAL BODIES.	NULL
	observation(s): magnetic	NULL	Measurement of any of the MAGNETIC ELEMENTS.	NULL
	observation(s): meteorological	气象观测	Evaluation or measurement of one or more meteorological elements.	对一个或多个气象要素进行的测量或评定。
	observation(s): tidal	NULL	A series of measurements taken in order to provide the information required for the REDUCTION OF SOUNDINGS, and the DATA for TIDAL PREDICT... more A series of measurements taken in order to provide the information required for the REDUCTION OF SOUNDINGS, and the DATA for TIDAL PREDICTION and investigation.	NULL
	observation equation	观测方程	See EQUATION.	通过观测函数把相关未知数连接起来的一种条件方程。
	observation spot (or pillar)	观测点	A position ashore determined from celestial observations.	由天文观测定位的岸上点。
	observation tower	观测台，观测塔	A tower from which one's surroundings can be observed, but at which a watch is not habitually maintained, as at a LOOKOUT TOWER. Such towe... more A tower from which one's surroundings can be observed, but at which a watch is not habitually maintained, as at a LOOKOUT TOWER. Such towers are temporarily erected for observations in geodetic networks.	可观测周围环境的塔，通常无人值守，如了望塔。这类塔在大地控制网中临时建立，用于观测。
	observed altitude	观测高度	See ALTITUDE.	经所有改正后的天体六分仪高度，参见apparent altitude（视高度）。在美国术语中，通常指真高度。
	observed tide	观测潮汐	Those data from tide observing equipment such as tide gauges, staffs, etc. "Actual tides" is an expression often used in referring to "obs... more Those data from tide observing equipment such as tide gauges, staffs, etc. "Actual tides" is an expression often used in referring to "observed tides".	由潮汐计、潮汐标尺等潮汐观测仪器测量得到的数据。“Actual tides”通常即指“observed tides”。
	obstruction	障碍物	In MARINE NAVIGATION, anything that hinders or prevents movement, particularly anything that endangers or prevents passage of a vessel. Th... more In MARINE NAVIGATION, anything that hinders or prevents movement, particularly anything that endangers or prevents passage of a vessel. The term is usually used to refer to an isolated danger to NAVIGATION, such as a SUNKEN ROCK or PINNACLE.	在航海中，指所有碍航物，特指危害或阻碍船舶航行的障碍物。此术语常指孤立障碍物，如暗礁或尖礁。
	obstruction buoy	障碍物浮标	A BUOY marking an OBSTRUCTION.	用于标示障碍物的浮标。
	obstruction light	障碍物灯标	See LIGHT.	指示存在障碍物的灯标。
	occasional light	偶用灯标	See LIGHT.	不经常使用的灯标。
	occluded front	锢囚锋	See OCCLUSION.	参见occlusion（锢囚）。
	occlusion	锢囚	Process of progressive decrease of area of warm sector at the EARTH's surface, and its ultimate disappearance, by the junction of the cold A... more Process of progressive decrease of area of warm sector at the EARTH's surface, and its ultimate disappearance, by the junction of the cold AIR MASSES which initially precede the WARM FRONT and follow the COLD FRONT. FRONT between these two cold AIR MASSES, after their junction (also termed occluded front).	因暖锋前的冷气团与冷锋后的冷气团的会聚，使地球表面暖区逐步减少，最终消失的过程。两股冷气团相... more 因暖锋前的冷气团与冷锋后的冷气团的会聚，使地球表面暖区逐步减少，最终消失的过程。两股冷气团相遇后，在其之间形成的锋面，亦称occluded front（锢囚锋）。
	occultation	隐遮，明暗；掩星	The concealment or extinguishment of the light of an AID TO NAVIGATION during the dark periods of its CYCLE. In ASTRONOMY, the concealment... more The concealment or extinguishment of the light of an AID TO NAVIGATION during the dark periods of its CYCLE. In ASTRONOMY, the concealment of a CELESTIAL BODY by another which crosses the line of view. Thus, the MOON occults a STAR when it passes between the observer and the STAR.	在航标灯光周期的黑暗期，灯光的隐遮或熄灭。在天文学中，指天体被穿过视线的另一天体所遮挡。因此... more 在航标灯光周期的黑暗期，灯光的隐遮或熄灭。在天文学中，指天体被穿过视线的另一天体所遮挡。因此，当月亮在观测者与恒星之间穿过时，月亮就遮挡了恒星。
	occupy	设站，施测	(v.t.). In SURVEYING, to observe with a surveying instrument at a STATION; also to set a surveying instrument over a point for the purpose o... more (v.t.). In SURVEYING, to observe with a surveying instrument at a STATION; also to set a surveying instrument over a point for the purpose of making OBSERVATIONS. In OCEANOGRAPHY, to stop a ship at a selected location, an OCEANOGRAPHIC STATION, for the purpose of gathering oceanographic observations.	（动词）。在测量学中，指在测站用测量仪器进行观测；亦指为观测而在某点放置测量仪器。在海洋学中... more （动词）。在测量学中，指在测站用测量仪器进行观测；亦指为观测而在某点放置测量仪器。在海洋学中，指为收集海洋观测值而将船停在某选定位置，如海洋观测站。
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