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	Eng ID	Term	Definition
	5561	time: Greenwich civil	See TIME: GREENWICH MEAN.
	5562	time: Greenwich mean (GMT) (or Greenwich civil)	MEAN SOLAR TIME at the GREENWICH MERIDIAN. See UNIVERSAL TIME (UT).
	5563	time: local	TIME based upon the LOCAL MERIDIAN as reference, as contrasted with that based upon a ZONE MERIDIAN, or the MERIDIAN of Greenwich. Any TIME ... more TIME based upon the LOCAL MERIDIAN as reference, as contrasted with that based upon a ZONE MERIDIAN, or the MERIDIAN of Greenwich. Any TIME kept locally.
	5564	time: local apparent	The APPARENT SOLAR TIME for the MERIDIAN of the observer.
	5565	time: local mean	The MEAN SOLAR TIME for the MERIDIAN of the observer.
	5566	time: local sidereal	The SIDEREAL TIME for the MERIDIAN of the observer.
	5567	time: mean	See TIME: MEAN SOLAR.
	5568	time: mean solar	TIME measured by the diurnal motion of the MEAN SUN, which is supposed to move uniformly in the CELESTIAL EQUATOR, completing the circuit in... more TIME measured by the diurnal motion of the MEAN SUN, which is supposed to move uniformly in the CELESTIAL EQUATOR, completing the circuit in one TROPICAL YEAR. Often termed simply mean time.
	5569	time: sidereal	TIME measured by the apparent diurnal rotation of the (true) VERNAL EQUINOX. It is counted from 0 HOUR, when the VERNAL EQUINOX is on the ME... more TIME measured by the apparent diurnal rotation of the (true) VERNAL EQUINOX. It is counted from 0 HOUR, when the VERNAL EQUINOX is on the MERIDIAN, through 24 HOURS. Naming the MERIDIAN of reference is essential to its complete identification.
	5570	time: solar	TIME based upon the ROTATION of the EARTH relative to the SUN. See TIME: APPARENT SOLAR, TIME: ASTRONOMICAL, TIME: CIVIL, TIME: MEAN SOLAR.
	5571	time: standard	A variation of ZONE TIME adapted for use on or near LAND, with irregular but well-defined zone limits.
	5572	time: summer	See TIME: DAYLIGHT SAVING.
	5573	time: true solar	See TIME: APPARENT SOLAR.
	5574	Time: Universal	See UNIVERSAL TIME (UT).
	5575	time: zone	The LOCAL MEAN TIME of a reference or zone meridian, whose TIME is kept throughout a designated ZONE. The ZONE MERIDIAN is usually the neare... more The LOCAL MEAN TIME of a reference or zone meridian, whose TIME is kept throughout a designated ZONE. The ZONE MERIDIAN is usually the nearest MERIDIAN whose LONGITUDE is exactly divisible by 15°.
	5576	time ball	A visual TIME SIGNAL in the form of a ball.
	5577	timepiece	An instrument for measuring TIME. See CHRONOMETER, CLOCK, WATCH.
	5578	time signal	See SIGNAL.
	5579	time tag	Reference assigned to each measurement input from a sensor to identify the time (either CPU, GPS, or UTC) when a measurement was actually ma... more Reference assigned to each measurement input from a sensor to identify the time (either CPU, GPS, or UTC) when a measurement was actually made by that particular sensor; time tags allow adjustment of data from different sensors to a common time reference.
	5580	time zone	See ZONE.
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