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Eng ID | Term | Definition |
---|---|---|---|
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5201 | sunset | The crossing of the APPARENT HORIZON by the upper LIMB of the descending SUN. |
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5202 | sunshine recorder | See HELIOGRAPH. |
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5203 | sunspot | Any of the dark spots sometimes seen at the surface of the SUN; they are believed to have some connection with magnetic disturbances on EAR... more |
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5204 | sunspot cycle | 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. |
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5205 | super high frequency (SHF) | See FREQUENCY: RADIO. |
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5206 | superior conjunction | See CONJUNCTION. |
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5207 | superior mirage | See MIRAGE. |
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5208 | superior planet(s) | See PLANET(S): SUPERIOR. |
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5209 | superior transit | See MERIDIAN TRANSIT. |
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5210 | superjacent waters | The waters lying immediately above the sea-bed or deep ocean floor up to the surface. |
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5211 | super-short baseline acoustic system | A variation of the short baseline system with three sensors incorporated in a single transducer. |
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5212 | supersonic | (adj.). Designating or of a SPEED greater than the SPEED of SOUND. |
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5213 | supplemental control | See CONTROL. |
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5214 | supplemental control point | A photoimage point for which an ELEVATION or a horizontal POSITION, or both, is to be, or has been determined. See also CONTROL POINT. |
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5215 | supplementary station | See STATION. |
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5216 | surf | Collective term for BREAKERS. The wave activity in the area between the SHORELINE and the outermost limit of BREAKERS. |
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5217 | surface boundary layer | See GROUND LAYER. |
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5218 | surface current | See CURRENT. |
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5219 | surface duct | A zone immediately below the sea surface where SOUND RAYS are refracted toward the surface and then reflected. They are refracted because th... more |
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5220 | surface mark | A STATION MARK used in addition to the UNDERGROUND MARK, over which it is plumbed. |