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	Eng ID	Term	Definition
	5541	tide wave	A long-period wave associated with the TIDE-PRODUCING FORCES of the MOON and SUN; identified with the rising and falling of the TIDE. Also c... more A long-period wave associated with the TIDE-PRODUCING FORCES of the MOON and SUN; identified with the rising and falling of the TIDE. Also called tide bulge. See TIDE, TIDAL MOVEMENT, STAND OF TIDE.
	5542	tideway	A CHANNEL through which a TIDAL CURRENT runs.
	5543	tie	A survey connection from a point of known POSITION to a point whose POSITION is desired. A tie is made to determine the POSITION of a supple... more A survey connection from a point of known POSITION to a point whose POSITION is desired. A tie is made to determine the POSITION of a supplementary point whose POSITION is desired for mapping or reference purposes, or to close a SURVEY on a previously determined point. To tie in is to make such a connection. The point to which the connection is made is termed a TIE POINT.
	5544	tie in	(v.i.). See TIE.
	5545	tie net	See TRIANGULATION NET.
	5546	tie point	Point of closure of a SURVEY either on itself or on another SURVEY.
	5547	till	Unstratified glacial DRIFT consisting of CLAY, SAND, GRAVEL, and BOULDERS intermingled in any proportions. Also called boulder clay.
	5548	tillite	ROCK formed of consolidated or lithified TILL and generally a record of a glacial EPOCH, older than that of the quarternary.
	5549	tilt	The angle which anything makes with the horizontal. In PHOTOGRAMMETRY, the angle at the PERSPECTIVE CENTRE between the photograph perpendi... more The angle which anything makes with the horizontal. In PHOTOGRAMMETRY, the angle at the PERSPECTIVE CENTRE between the photograph perpendicular and the PLUMB LINE, or other exterior REFERENCE DIRECTION; also, the dihedral angle between the plane of the PHOTOGRAPH and the horizontal plane.
	5550	tilt: base	In PHOTOGRAMMETRY, the INCLINATION of the AIR BASE with respect to the horizontal.
	5551	tilt: relative	The angular relationship between two overlapping VERTICAL PHOTOGRAPHS with no reference to an established DATUM.
	5552	tilting level	See LEVELLING INSTRUMENT: TILTING LEVEL.
	5553	time	The measurable aspect of duration. The HOUR of the DAY reckoned by the position of a celestial reference point relative to a reference CELES... more The measurable aspect of duration. The HOUR of the DAY reckoned by the position of a celestial reference point relative to a reference CELESTIAL MERIDIAN. An elapsed interval.
	5554	time: apparent	See TIME: APPARENT SOLAR.
	5555	time: apparent solar	TIME measured by the apparent diurnal motion of the (true) SUN. Also called true solar time, and often apparent time.
	5556	time: astronomic(al)	SOLAR TIME in a DAY (ASTRONOMICAL DAY) that begins at NOON.
	5557	time: civil	SOLAR TIME in a DAY (CIVIL DAY) that begins at MIDNIGHT.
	5558	time: daylight saving	A variation of ZONE TIME, usually one HOUR ahead of that TIME. Sometimes called summer time.
	5559	time: geologic(al)	The division into a number of great ERAS, each represented by a group of ROCKS.
	5560	time: Greenwich	TIME based upon the GREENWICH MERIDIAN as reference.
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