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	Eng ID	Term	Definition
	1641	equation: condition	An equation which expresses exactly certain relationships that must exist among related quantities, which are not independent of one another... more An equation which expresses exactly certain relationships that must exist among related quantities, which are not independent of one another, exist a priori, and are separate from relationships demanded by OBSERVATION.
	1642	equation: correlate	An equation derived from an OBSERVATION or CONDITION EQUATION, using undetermined multipliers, and expressing the condition that the sum of ... more An equation derived from an OBSERVATION or CONDITION EQUATION, using undetermined multipliers, and expressing the condition that the sum of the squares of the RESIDUAL ERRORS resulting from the application of these multipliers to the OBSERVATION or CONDITION EQUATIONS shall be a minimum.
	1643	equation: error	The probability equation which expresses the laws of the occurrence of ACCIDENTAL ERRORS. The error equation is the basis of the method of L... more The probability equation which expresses the laws of the occurrence of ACCIDENTAL ERRORS. The error equation is the basis of the method of LEAST SQUARES, used in the ADJUSTMENT of OBSERVATIONS for determining the most probable value of a result from those OBSERVATIONS.
	1644	equation: Laplace	An equation which expresses the relationships between ASTRONOMIC AZIMUTH, GEODETIC AZIMUTH, and the ASTRONOMIC LONGITUDE and GEODETIC LONGIT... more An equation which expresses the relationships between ASTRONOMIC AZIMUTH, GEODETIC AZIMUTH, and the ASTRONOMIC LONGITUDE and GEODETIC LONGITUDE.
	1645	equation: normal	One of a set of simultaneous equations derived from OBSERVATION, CONDITION or CORRELATE EQUATIONS. In a least-squares adjustment, values ob... more One of a set of simultaneous equations derived from OBSERVATION, CONDITION or CORRELATE EQUATIONS. In a least-squares adjustment, values obtained from the solution of normal equations (either directly or through the CORRELATE EQUATIONS) are applied to the OBSERVATION or CONDITION EQUATIONS to obtain the desired CORRECTIONS.
	1646	equation: observation	A CONDITION EQUATION which connects interrelated unknowns by means of an observed function.
	1647	equation: personal	See PERSONAL EQUATION.
	1648	equation method	In tidal terminology, an elaborate non-harmonic method for the prediction of TIDES.
	1649	equation of time	The CORRECTION to be applied to 12 hours plus UNIVERSAL TIME to obtain the Greenwich HOUR ANGLE of the SUN, or more generally the CORRECTION... more The CORRECTION to be applied to 12 hours plus UNIVERSAL TIME to obtain the Greenwich HOUR ANGLE of the SUN, or more generally the CORRECTION to be applied to 12 hours plus LOCAL MEAN TIME to obtain the LOCAL HOUR ANGLE of the SUN.
	1650	equator	The PRIMARY GREAT CIRCLE of a sphere or SPHEROID such as the EARTH, perpendicular to the polar AXIS.
	1651	equator: astronomical	A line connecting points having 0° ASTRONOMICAL LATITUDE.
	1652	equator: celestial	The GREAT CIRCLE on the CELESTIAL SPHERE whose plane is perpendicular to the AXIS of the EARTH. Also called equinoctial.
	1653	equator: geodetic	The line on the SPHEROID connecting points of 0° GEODETIC LATITUDE.
	1654	equator: heat	See EQUATOR: THERMAL.
	1655	equator: magnetic	That line on the surface of the EARTH connecting all points at which the magnetic DIP is zero. Also called aclinic line.
	1656	equator: terrestrial	A GREAT CIRCLE of the EARTH in the plane of the CELESTIAL EQUATOR, and equidistant from the two POLES.
	1657	equator: thermal	Line which circumscribes the EARTH and connects all points of highest mean annual temperature on each MERIDIAN. Also called heat equator.
	1658	equatorial calms	Zone of calm or light variable WINDS encountered, in certain regions, between the TRADE WINDS of the two hemispheres.
	1659	equatorial horizontal parallax	See PARALLAX.
	1660	equatorial tide(s)	See TIDE.
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