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shutter: focal-plane | 焦面快门，帘式快门
| A SHUTTER located near the FOCAL PLANE; usually consisting of a curtain with a slot which is pulled across the FOCAL PLANE to make the EXP... more | 位于焦面附近的快门，一般由带缝隙的遮光帘构成，遮光帘拉离焦平面产生曝光。 |
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shutter: louver | 隔栅快门，百叶窗式快门
| A SHUTTER consisting of a number of thin metal strips or louvers which operate like a venetian blind to make the EXPOSURE; usually located j... more | 由数个薄金属条或格栅组成的快门，以操纵百叶窗方式曝光。一般位于紧挨透镜的前部或后部。 |
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side echo(es) | 副回声 | See ECHO(ES): FALSE. | 在回声测深中，同海藻或鱼等无关物质或者由温度或盐度（或二者同时）突然变化而形成的海水层回波。... more |
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side lap | 旁向重叠 | See OVERLAP. | 在制图学及测量学中，表示一张海图或外业原图延伸到相邻海图或原图的程度。在摄影测量中，表示同一... more |
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side-looking airborne radar (SLAR) | 侧视航空雷达，机载侧视雷达 | A radar system using a stabilized antenna orientated at right angles to the aircraft flight path. | 将天线固定在飞机航线正交方向的雷达系统。 |
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side scan sonar | 侧扫声纳 | A form of active sonar in which fixed acoustic beams are directed into the water perpendicularly to the direction of travel to scan the bo... more | 一种主动声纳，与航向正交的固定声束射向海底，对海底扫描，并产生海底形状的数据记录。 |
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side scan sonar mosaic | 侧扫声纳图像镶嵌 | An assembly of side scan sonar images whose edges have been cut or torn and matched to form a continuous side scan sonar image. | 侧扫声纳声图图像的拼贴。图像的边缘被裁切或撕开，拼接为连续形的侧扫声纳图像。 |
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sidereal | 星的，星座的 | (adj.). Of or pertaining to the STARS. | 与星有关的。 |
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sidereal chronometer | 恒星天文钟 | See CHRONOMETER. | 指示某处或对应于某一子午线的恒星时的天文钟。 |
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sidereal day | 恒星日 | See DAY. | 以春分点为基点，地球自转一周所经历的时间，通过春分点连续上中天加以量度。由于分点岁差，这样确... more |
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sidereal hour angle | 恒星时角 | See HOUR ANGLE. | 天球子午线向西量的角距，天球子午线的上半部和天体或春分点的时圈在天极处的夹角，或在天球赤道上... more |
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sidereal month | 恒星月 | See MONTH. | 月球相继两次经过同一恒星所经历的时间。恒星月平均=27.321661个平太阳日。 |
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sidereal time | 恒星时 | See TIME. | 根据真春分点周日视运动测定的时间。当春分点在某点子午圈上中天，即零时，从零时起算，经过24小时，... more |
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sidereal year | 恒星年 | See YEAR. | 地球或某无自行运动的远星相对于某固定点绕太阳视公转一周所需的时间。1900年的时间为365天6小时9分9.5... more |
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side shot | 旁点观测 | A reading or measurement from a survey station to locate a point which is not intended to be used as a base for the extension of the SURVEY.... more | 自测站对某一点的读数或观测，目的仅在于确定其位置，而不准备用作扩展测量控制网的基础。旁点观测... more |
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siemens | 西门子 | The unit of conductance in the SI SYSTEM. | 国际标准单位制中的电导单位。 |
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sight | 观测，测视； 瞄准器 | OBSERVATION of the ALTITUDE, and sometimes also the AZIMUTH of a CELESTIAL BODY for a LINE OF POSITION, or the DATA obtained by such OBSER... more | 高度的观测；有时指确定位置线所需的天体方位角观测；以及通过这些观测所获得的数据。用以帮助眼睛... more |
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sight line | 视线，照准线 | See COLLIMATION: LINE OF. | 望远镜物镜光心与十字线中心的联线。亦称 line of sight，sight line，pointing line 或aiming line of the instrument。 |
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sight (or sighting) vane | 瞄准器，砚板 | See VANE. | 指示风向的仪器。参见anemometer（风速计）。
用于观测目标方位的瞄准器，与哑罗经、测向罗经的瞄准器... more |
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sigma-t | （海水）条件密度 | Symbol σ t). A conveniently abbreviated value of the DENSITY of a sea water sample of TEMPERATURE t and SALINITY S: σt = (rho(S,t)-1) * 10... more | 以温度t和盐度S表示的海水样品密度的简便近似值：
σt = (rho(S,t)-1) * 10³
式中rho(S,t)是标准大气压下以CGS... more |