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Eng ID Term Definition
4841
solar day
See DAY.
4842
solar eclipse
See ECLIPSE.
4843
solar parallax
See PARALLAX.
4844
solar radiation
RADIATION emitted by the SUN.
4845
solar system
The SUN and other CELESTIAL BODIES within its gravita­tional influence, including PLANETS, PLANE­TOIDS, SATELLITES, COMETS, and METEORS.
4846
solar tide
See TIDE.
4847
solar time
See TIME.
4848
solar year
See YEAR: TROPICAL.
4849
solenoid
A coil of wire, often helical in form, which becomes an electromagnet when an electric current is passed through it.
4850
solid
Matter of stable shape, not liquid or fluid.
4851
solitary wave
See WAVE.
4852
solstice
One of the two points of the ECLIPTIC farthest from the CELESTIAL EQUATOR; one of the two points on the CELESTIAL SPHERE occupied by the SUN... more
One of the two points of the ECLIPTIC farthest from the CELESTIAL EQUATOR; one of the two points on the CELESTIAL SPHERE occupied by the SUN at maximum north or south DECLINATION. That in the northern hemisphere is called the summer solstice or first point of Cancer, and that in the southern hemisphere, the winter solstice or first point of Capricorn. Also called solsticial point. That instant at which the SUN reaches one of the solstices, about June 21 (summer solstice) or December 22 (winter solstice).
4853
solsticial colure
See COLURE: SOLSTICIAL.
4854
solsticial point
See SOLSTICE.
4855
solsticial tide(s)
See TIDE.
4856
sonar
A system of determin­ing distance of an underwa­ter object by measuring the interval of time between transmission of an underwater sonic or ... more
A system of determin­ing distance of an underwa­ter object by measuring the interval of time between transmission of an underwater sonic or ultrasonic SIGNAL and the return of its ECHO. Direction may also be determined by noting the direction of transmission of the SIGNAL. The name sonar is derived from the words sound navigation and ranging. See ECHO RANGING.
4857
sonargram
The analog echo record produced by the side scan sonar recording device on special chemically-treated paper.
4858
sonar target
An object which reflects a sufficient amount of a sonar signal to produce a detectable echo signal at the sonar equip­ment.
4859
sonic bearing
See BEARING.
4860
sonic depth finder
See ECHO SOUNDER.