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Eng ID Term Definition
4741
shutter: focal-plane
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 EXPO... more
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 EXPOSURE.
4742
shutter: louver
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
A SHUTTER consisting of a number of thin metal strips or louvers which operate like a venetian blind to make the EXPOSURE; usually located just in front of or just behind the LENS.
4743
side echo(es)
See ECHO(ES): FALSE.
4744
side lap
See OVERLAP.
4745
side-looking airborne radar (SLAR)
A radar system using a stabilized antenna orientated at right angles to the aircraft flight path.
4746
side scan sonar
A form of active sonar in which fixed acoustic beams are directed into the water perpendicu­larly to the direction of travel to scan the bot... more
A form of active sonar in which fixed acoustic beams are directed into the water perpendicu­larly to the direction of travel to scan the bottom and generate a record of the bottom configuration.
4747
side scan sonar mosaic
An assembly of side scan sonar images whose edges have been cut or torn and matched to form a continuous side scan sonar image.
4748
sidereal
(adj.). Of or pertaining to the STARS.
4749
sidereal chronometer
See CHRONOMETER.
4750
sidereal day
See DAY.
4751
sidereal hour angle
See HOUR ANGLE.
4752
sidereal month
See MONTH.
4753
sidereal time
See TIME.
4754
sidereal year
See YEAR.
4755
side shot
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
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. A side shot is usually made for the purpose of determining the POSITION of some object which is to be shown on the MAP.
4756
siemens
The unit of conductance in the SI SYSTEM.
4757
sight
OBSERVATION of the ALTITUDE, and sometimes also the AZIMUTH of a CELESTIAL BODY for a LINE OF POSITI­ON, or the DATA obtained by such OBSERV... more
OBSERVATION of the ALTITUDE, and sometimes also the AZIMUTH of a CELESTIAL BODY for a LINE OF POSITI­ON, or the DATA obtained by such OBSERVATION. Any of various devices used to aid the eyes in lining up an optical instrument on its OBJECTIVE.
4758
sight line
See COLLIMATION: LINE OF.
4759
sight (or sighting) vane
See VANE.
4760
sigma-t
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) * 1000... more
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) * 1000 , where rho(S,t) is the value of the sea water density in CGS units at standard ATMOSPHERIC PRESSURE. If, for example, rho(S,t) = 1.02648, then σt = 26.48.