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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 o... 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.