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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 o... 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.
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