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	Eng ID	Term	Definition
	3701	parallax correction	A CORRECTION due to PARALLAX, particularly that SEXTANT ALTITUDE correction due to the difference between the apparent direction from a poin... more A CORRECTION due to PARALLAX, particularly that SEXTANT ALTITUDE correction due to the difference between the apparent direction from a point on the surface of the EARTH to a CELESTIAL BODY and the apparent direction from the centre of the EARTH to the same body.
	3702	parallax difference	In PHOTOGRAMMETRY, the difference in the ABSOLUTE STEREOSCOPIC PARALLAXES of two points imaged on a pair of PHOTOGRAPHS. Customarily used i... more In PHOTOGRAMMETRY, the difference in the ABSOLUTE STEREOSCOPIC PARALLAXES of two points imaged on a pair of PHOTOGRAPHS. Customarily used in determination of the difference in ELEVATIONS of objects.
	3703	parallax in altitude	GEOCENTRIC PARALLAX of a body at any ALTITUDE. The expression is used to distinguish the PARALLAX at the given ALTITUDE from the HORIZONTAL ... more GEOCENTRIC PARALLAX of a body at any ALTITUDE. The expression is used to distinguish the PARALLAX at the given ALTITUDE from the HORIZONTAL PARALLAX when the body is in the HORIZON.
	3704	parallax inequality	The variation in the RANGE OF TIDE or in the SPEED of TIDAL CURRENTS due to the continual change in the distance of the MOON from the EARTH.
	3705	parallel	A circle (or approximation of a circle) on the surface of the EARTH, parallel to the EQUATOR and connecting points of equal LATITUDE. Also c... more A circle (or approximation of a circle) on the surface of the EARTH, parallel to the EQUATOR and connecting points of equal LATITUDE. Also called parallel of latitude.
	3706	parallel: astronomical	A line on the surface of the EARTH which has the same ASTRONOMICAL LATITUDE at every point. Because the DEFLECTION OF THE VERTICAL is not th... more A line on the surface of the EARTH which has the same ASTRONOMICAL LATITUDE at every point. Because the DEFLECTION OF THE VERTICAL is not the same at all points on the EARTH, an astronomical parallel is an irregular line, not lying in a single plane.
	3707	parallel: celestial	See PARALLEL OF DECLINATION.
	3708	parallel: geodetic	A line on the SPHEROID which has the same GEODETIC LATITUDE at every point. A geodetic parallel, other than the EQUATOR, is not a GEODETIC L... more A line on the SPHEROID which has the same GEODETIC LATITUDE at every point. A geodetic parallel, other than the EQUATOR, is not a GEODETIC LINE. In form, it is a SMALL CIRCLE whose plane is parallel with the plane of the GEODETIC EQUATOR.
	3709	parallel: geographic(al)	A line on the EARTH having the same LATITUDE at every point. The term is applicable alike to an ASTRONOMICAL PARALLEL or to a GEODETIC PAR... more A line on the EARTH having the same LATITUDE at every point. The term is applicable alike to an ASTRONOMICAL PARALLEL or to a GEODETIC PARALLEL.
	3710	parallel: ground	In PHOTOGRAMMETRY, the intersection of the plane of the PHOTOGRAPH with the plane of reference of the GROUND. See also AXIS OF HOMOLOGY.
	3711	parallel: isometric	In PHOTOGRAMMETRY, the intersecting line between the plane of a PHOTOGRAPH and a horizontal plane having an equal perpendicular distance ... more In PHOTOGRAMMETRY, the intersecting line between the plane of a PHOTOGRAPH and a horizontal plane having an equal perpendicular distance from the same PERSPECTIVE CENTRE.
	3712	parallel: photograph	In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH of any horizontal line in the object space which is perpendicular to the PRINCIPAL PLANE. All p... more In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH of any horizontal line in the object space which is perpendicular to the PRINCIPAL PLANE. All photograph parallels are perpendicular to the PRINCIPAL LINE. The photograph parallel passing through the PRINCIPAL POINT is the principal parallel and that passing through the ISOCENTRE is the ISOMETRIC PARALLEL.
	3713	parallel: principal	See PARALLEL: PHOTOGRAPH.
	3714	parallel: standard	A PARALLEL of latitude which is used as a control in the computation of a map PROJECTION. For a tangent cone, this is the PARALLEL of tangen... more A PARALLEL of latitude which is used as a control in the computation of a map PROJECTION. For a tangent cone, this is the PARALLEL of tangency. For a secant cone, the two PARALLELS of intersection are the standards.
	3715	parallel motion protractor	See PROTRACTOR.
	3716	parallel of altitude	See ALMUCANTAR.
	3717	parallel of declination	A circle of the CELESTIAL SPHERE parallel to the CELESTIAL EQUATOR. Also called celestial parallel.
	3718	parallel of latitude	See PARALLEL.
	3719	parallel plate	An optical disk with optically flat, parallel surfaces; used especially in optical MICROMETERS.
	3720	parallel rulers (or rule)	An instrument for transferring a line parallel to itself.
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