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sunset | 日落 | The crossing of the APPARENT HORIZON by the upper LIMB of the descending SUN. | 太阳下降至上边缘越过视地平线。 |
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sunshine recorder | 日照计 | See HELIOGRAPH. | 将太阳光从一点反射到另一点以传递信息的一种仪器。
在气象学中，在太阳光照射达到投射清晰阴影的足... more |
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sunspot | 太阳黑子 | Any of the dark spots sometimes seen at the surface of the SUN; they are believed to have some connection with magnetic disturbances on EA... more | 太阳表面有时可以看到的黑斑，据说他们与地球上的电磁干扰有某些关联。 |
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sunspot cycle | （太阳）黑子周期 | The time interval (11.2 YEARS) during which the number of SUNSPOTS progresses from a minimum to a maximum and decreases again to a minimum. | 太阳黑子数目从最小发展到最大，又减至最小的时间间隔。 |
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super high frequency (SHF) | 超高频 | See FREQUENCY: RADIO. | 无线电通讯中，电磁波的有效辐射频率。无线电频率通常分为：甚低频（30千赫以内）、低频（30-300千赫）... more |
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superior conjunction | 上合 | See CONJUNCTION. | 当太阳处在地球和内行星之间时，内行星和太阳的结合称为“上合”。 |
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superior mirage | 上现蜃景 | See MIRAGE. | 海市蜃楼的特例，可在雪地、冰冷的海上等处上空观察到，其虚“像”出现在现实物体之上。在这种情况... more |
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superior planet(s) | 地外行星 | See PLANET(S): SUPERIOR. | 轨道在地球外的行星：火星、木星、土星、天王星、海王星、冥王星。 |
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superior transit | 上中天 | See MERIDIAN TRANSIT. | 指天体在天球子午圈的视通过。上中天是穿过天球子午圈上半子午圈的通过。下中天是穿过下半子午圈的... more |
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superjacent waters | 上覆水域 | The waters lying immediately above the sea-bed or deep ocean floor up to the surface. | 从海床或深洋底直到海面瞬间停驻的水团。 |
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super-short baseline acoustic system | 超短基线声学系统 | A variation of the short baseline system with three sensors incorporated in a single transducer. | 短基线声学系统的变体，在该系统的单换能器中有三个传感器。 |
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supersonic | 超声（波，速）的 | (adj.). Designating or of a SPEED greater than the SPEED of SOUND. | 速率比声速大的。 |
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supplemental control | 辅助控制 | See CONTROL. | 用辅助测量的方法（即把测图用的航空照片与大地控制系统关联起来）建立的控制点。这种点必须能在像... more |
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supplemental control point | 辅助控制点 | A photoimage point for which an ELEVATION or a horizontal POSITION, or both, is to be, or has been determined. See also CONTROL POINT. | 高程或水平位置待测定或已被测定的像点。 |
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supplementary station | 补点，辅助点 | See STATION. | 在给定区域为增加控制点数量而设立的辅助测站，或在不可能或不需要设置主测站的地方所设的站。亦称se... more |
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surf | 碎波，拍岸浪 | Collective term for BREAKERS. The wave activity in the area between the SHORELINE and the outermost limit of BREAKERS. | 浪花的统称。岸线与浪花最外界限间的波浪运动。 |
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surface boundary layer | 地面边界层 | See GROUND LAYER. | 靠近地面10-100米，厚度不一的大气层。亦称surface boundary layer。 |
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surface current | 表层流 | See CURRENT. | 离水面不超过2-3米的海流。 |
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surface duct | 表面声波道 | A zone immediately below the sea surface where SOUND RAYS are refracted toward the surface and then reflected. They are refracted because th... more | 紧靠海面下的一个区域，在此区域内声射线折向海面然后反射。由于表面附近某些深度的声速比在表面大... more |
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surface mark | 地面标志 | A STATION MARK used in addition to the UNDERGROUND MARK, over which it is plumbed. | 在地下标志之上竖立的测站标志。 |