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	Eng ID	Term	Definition
	1661	equidistance line	See MEDIAN LINE.
	1662	equilibrium	A state of balance between forces.
	1663	equilibrium argument	The theoretical PHASE of a CONSTITUENT of the EQUILIBRIUM TIDE.
	1664	equilibrium tide	See TIDE.
	1665	equinoctial	See EQUATOR: CELESTIAL.
	1666	equinoctial colure	See COLURE.
	1667	equinoctial point	See EQUINOX.
	1668	equinoctial spring tide(s)	See TIDE.
	1669	equinoctial system of coordinates	See CELESTIAL EQUATOR SYSTEM OF COORDINATES.
	1670	equinoctial year	See YEAR: TROPICAL.
	1671	equinox	One of the two points of intersection of the ECLIPTIC and the CELESTIAL EQUATOR, occupied by the SUN when its DECLINATION is zero. That poin... more One of the two points of intersection of the ECLIPTIC and the CELESTIAL EQUATOR, occupied by the SUN when its DECLINATION is zero. That point occupied on or about March 21, when the SUN's DECLINATION changes from south to north, is called vernal equinox or first point of Aries; that point occupied on or about September 23, when the DECLINATION changes from north to south, is called autumnal equinox or first point of Libra. Also called equinoctial point.
	1672	equinoxes: precession of	See PRECESSION OF THE EQUINOXES.
	1673	equiphase zone	See ZONE.
	1674	equipotential surface	A surface having the same potential of GRAVITY at every point.
	1675	equisignal zone	See ZONE.
	1676	equivalent focal length	See FOCAL LENGTH.
	1677	equivalent projection	See PROJECTION: EQUAL AREA.
	1678	equivalent scale	See SCALE.
	1679	era	In GEOLOGY, any of the main divisions of GEOLOGICAL TIME.
	1680	erect image	See IMAGE.
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