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	Eng ID	Term	Definition
	1561	eclipse	The obscuration of a source of light by the intervention of an object. Whole or partial obscuration of a HEAVENLY BODY by the interposition ... more The obscuration of a source of light by the intervention of an object. Whole or partial obscuration of a HEAVENLY BODY by the interposition of another, or by the passing of one luminous HEAVENLY BODY into the shadow of another.
	1562	eclipse: annular	An ECLIPSE in which a thin ring of the source of light appears around the obscuring body. Annular SOLAR ECLIPSES occur, but never annular LU... more An ECLIPSE in which a thin ring of the source of light appears around the obscuring body. Annular SOLAR ECLIPSES occur, but never annular LUNAR ECLIPSES.
	1563	eclipse: lunar	An ECLIPSE of the MOON. When the MOON enters the shadow of the EARTH, it appears eclipsed to an observer on the EARTH.
	1564	eclipse: partial	An ECLIPSE in which only part of the source of light is obscured.
	1565	eclipse: solar	An ECLIPSE of the SUN. When the MOON passes between the SUN and the EARTH, the SUN appears eclipsed to an observer in the MOON's shadow.
	1566	eclipse: total	An ECLIPSE in which the entire source of light is obscured.
	1567	ecliptic	The GREAT CIRCLE formed by the intersection of the plane of the EARTH's ORBIT around the SUN (or apparent ORBIT of the SUN around the EARTH)... more The GREAT CIRCLE formed by the intersection of the plane of the EARTH's ORBIT around the SUN (or apparent ORBIT of the SUN around the EARTH) and the CELESTIAL SPHERE.
	1568	ecliptic latitude	See LATITUDE: CELESTIAL.
	1569	ecliptic system of coordinates	A set of CELESTIAL COORDINATES based on the ECLIPTIC as the PRIMARY GREAT CIRCLE; CELESTIAL LATITUDE and CELESTIAL LONGITUDE.
	1570	ecology	The science of the economy of animals and plants dealing with the relations of living organism to their surroundings.
	1571	eddy	A circular movement of water usually formed, where CURRENTS pass OBSTRUCTIONS, between two adjacent CURRENTS flowing counter to each other, ... more A circular movement of water usually formed, where CURRENTS pass OBSTRUCTIONS, between two adjacent CURRENTS flowing counter to each other, or along the edge of a PERMANENT CURRENT.
	1572	eddy viscosity	The turbulent transfer of momentum by EDDIES giving rise to an internal fluid friction, in a manner analogous to the action of molecular vis... more The turbulent transfer of momentum by EDDIES giving rise to an internal fluid friction, in a manner analogous to the action of molecular viscosity in LAMINAR FLOW, but taking place on a much larger scale. The alue of the coefficient of eddy viscosity is of the order 104 square centimetres per SECOND.
	1573	edge	In TOPOGRAPHY, the CREST of a sharply pointed RIDGE.
	1574	edge wave	See WAVE.
	1575	eelgrass	See SEAGRASS.
	1576	Ekman bottle	A REVERSING WATER BOTTLE which can be closed watertight by means of plates seated in rubber. When at the desired DEPTH, the reversing mechan... more A REVERSING WATER BOTTLE which can be closed watertight by means of plates seated in rubber. When at the desired DEPTH, the reversing mechanism is tripped by a MESSENGER.
	1577	Ekman current meter	A widely used instrument for measuring the SPEED and direction of the CURRENT at any DEPTH. It is designed for use from a ship or boat at an... more A widely used instrument for measuring the SPEED and direction of the CURRENT at any DEPTH. It is designed for use from a ship or boat at anchor when the STREAM does not attain a rate of more than 3 to 3 1/2 KNOTS.
	1578	Ekman spiral	Spiral, polar DIAGRAM of the extremities of the wind vectors at different HEIGHTS, representing the variation of the WIND with HEIGHT in the... more Spiral, polar DIAGRAM of the extremities of the wind vectors at different HEIGHTS, representing the variation of the WIND with HEIGHT in the FRICTION LAYER on the basis of various simplifying assumptions. The Ekman spiral is also applied to the variation of wind-driven OCEAN CURRENTS with DEPTH below the surface.
	1579	elbow	A sudden turn in a CHANNEL, RIVER, or SHORELINE.
	1580	electric log	See LOG.
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