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Eng ID Term Definition
1621
enhanced group call (EGC)
The system for broadcasting messages via the mobile satellite communications system operated by Inmarsat. EGC is a part of the INMARSAT-C s... more
The system for broadcasting messages via the mobile satellite communications system operated by Inmarsat. EGC is a part of the INMARSAT-C system.
1622
entrance
The SEAWARD end of a CHANNEL, HARBOUR, DOCK, etc.
1623
entrance pupil
The IMAGE of the APERTURE STOP formed by all the LENS ELEMENTS on the object side of the APERTURE STOP.
1624
entrance window
The IMAGE of the FIELD STOP formed by all the LENS ELEMENTS on the object side of the FIELD STOP.
1625
envelope
In electronics, a graph defining the variations in AMPLITUDE of successive OSCILLATIONS in an amplitude-modulated wave.
1626
envelope edge
The fore part of an ENVELOPE.
1627
environment
The sum total of all external conditions which may affect an organism, community, material, or energy if brought under the influence of thes... more
The sum total of all external conditions which may affect an organism, community, material, or energy if brought under the influence of these external conditions.
1628
Environmentally Sensitive Sea Area (ESSA)
 A generic term which is used to describe a wide range of areas, considered sensitive for a variety of environmental reasons.
1629
Eotvos balance
See TORSION BALANCE.
1630
Eotvos correction
A correction applied to gravity measurements to balance the effect of the vertical force experienced by a body moving in an east-west direct... more
A correction applied to gravity measurements to balance the effect of the vertical force experienced by a body moving in an east-west direction on the rotating earth.
1631
Eotvos effect
The east-west component of the movement of a ship, including the effect of marine currents, modifies the centrifugal force of the earth's ro... more
The east-west component of the movement of a ship, including the effect of marine currents, modifies the centrifugal force of the earth's rotation. It is a vertical force experienced by a body moving in an east-west direction on the rotating earth.
1632
epact (of the year)
The AGE OF THE MOON at 00 HOUR on January 1.
1633
ephemeris
A statement presenting POSITIONS and related DATA for a CELESTIAL BODY for given EPOCHS (dates) at uniform intervals of time. Also a publica... more
A statement presenting POSITIONS and related DATA for a CELESTIAL BODY for given EPOCHS (dates) at uniform intervals of time. Also a publication containing such DATA for a number of CELESTIAL BODIES. See also ALMANAC: AIR and ALMANAC: NAUTICAL.
1634
epicentre (or epicenter, epicentrum)
The point of the EARTH's surface directly above the FOCUS of an EARTHQUAKE.
1635
epipolar plane
Any plane which contains the EPIPOLES; therefore any plane containing the AIR BASE. Also called basal plane.
1636
epipolar ray
The line on the plane of a PHOTOGRAPH joining the EPIPOLE and the IMAGE of an object. Also expressed as the trace of an EPIPOLAR PLANE on a ... more
The line on the plane of a PHOTOGRAPH joining the EPIPOLE and the IMAGE of an object. Also expressed as the trace of an EPIPOLAR PLANE on a PHOTOGRAPH.
1637
epipoles
In the perspective set-up of two PHOTOGRAPHS, (two perspective projections), the points on the planes of the PHOTOGRAPHS where they are cut ... more
In the perspective set-up of two PHOTOGRAPHS, (two perspective projections), the points on the planes of the PHOTOGRAPHS where they are cut by the AIR BASE.
1638
epoch
A given period of time during which a series of related acts or events takes place. In ASTRONOMY, a particular instant for which certain DAT... more
A given period of time during which a series of related acts or events takes place. In ASTRONOMY, a particular instant for which certain DATA are given or at which an OBSERVATION is made, and which then is usable as a REFERENCE POINT.
1639
equal altitudes
Two ALTITUDES of the same CELESTIAL BODY observed east and then west of the MERIDIAN, when it has reached the same value. The expression als... more
Two ALTITUDES of the same CELESTIAL BODY observed east and then west of the MERIDIAN, when it has reached the same value. The expression also applies to the practice, essentially obsolete, of determining the instant of local APPARENT NOON by observing equal ALTITUDES of the SUN.
1640
equal area projection
See PROJECTION.