| Earth |
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proper noun
- The third planet in order from the Sun, upon which humans live; represented in astronomy and astrology by � and �.
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| earthlight |
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noun
- sunlight reflected from the earth's surface
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| Earthshine |
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noun
- (astronomy) Reflected earthlight visible on the Moon's night side.
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| eccentric |
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noun
- A disk or wheel with its axis off centre, giving a reciprocating motion.
- One who does not behave like others.
- (slang) a kook
adjective
- Not at or in the centre.
- Not perfectly circular
- an eccentric or elliptical orbit
- Having a different center.
- Deviating from the norm; behaving unexpectedly or differently.
- "He has become really eccentric over the years."
- (physiology) (of a motion) against or in the opposite direction of contraction of a muscle. (E.g. flexion of the lower arm while flexing the tricep; opening of the jaw while flexing the masseter). (Antonym: Concentric)
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| eclipse |
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noun
- An astronomical alignment in which a planetary object (for example, the Moon) comes between the sun and another planetary object (for example, the Earth), resulting in a shadow being cast by the middle object onto the other object.
- A seasonal state of plumage in some birds, notably ducks, adopted temporarily after the breeding season and characterised by a dull and scruffy appearance.
verb (eclipses, eclipsing, eclipsed)
- (transitive) Of atronomical bodies, to cause an eclipse.
- The Moon eclipsed the Sun.
- (transitive) To overshadow; to be better or more noticeable than.
- The student"s skills soon eclipsed those of his teacher.
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| egress |
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noun
- An exit or way out
- The window provides an in the event of an emergency.
- The process of exiting or leave, leaving.
verb (egress, es)
- (intransitive) To exit or leave; to go or come out.
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| elliptical |
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adjective
- In a shape reminding of an ellipse; oval.
- Of, or showing ellipsis; having a word or words omitted.
- If he is sometimes and obscure, it is because he has so much to tell us -- w:Edmund Wilson, Edmund Wilson
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| elongation |
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noun - The act of lengthening, or the state of being lengthened; protraction; extension.
- That which lengthens out; continuation.
- Removal to a distance; withdrawal; a being at a distance; distance.
- The angular distance of a planet from the sun; as, the elongation of Venus or Mercury.
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| Elysium |
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proper noun
- (Classical mythology) the home of the blessed after death.
- A place or state of ideal happiness; paradise.
- A region in the northern hemisphere of Mars.
adjective
- blissful; euphoric
- of or pertaining to Elysium.
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| Enceladus |
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proper noun
- a giant in Greek mythology
- (astronomy) the seventh moon of Saturn
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| eon |
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noun
- (also temporal í¦on) Eternity.
- A period of 1,000,000,000 years.
- (geology): The longest time period used in geology.
- (informal, hyperbolically) A long period of time.
- It's been eons since we last saw each other.
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| epicycle |
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noun - (astronomy) (in Ptolemaic cosmology) a small circle, moving around the circumference of a larger circle having the earth at its centre; the supposed orbit of a planet
- (mathematics) any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid
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| equator |
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noun
- An imaginary great circle around the earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere.
- A similar great circle on any sphere, especially on a celestial body, or on other reasonably symmetrical three-dimensional body.
- A short form of the celestial equator.
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| equinoctial |
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noun
- the great circle midway between the celestial poles; the celestial equator
adjective
- of, or relating to an equinox
- of, or relating to the celestial or terrestrial equator
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| equinox |
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noun
- the intersection of the ecliptic (apparent path of the sun) with the celestial equator. Vernal Equinox is the intersection that the sun crosses about March 20; autumnal equinox denotes the crossing point about September 23.
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| Equuleus |
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proper noun
- (constellation) The second smallest constellation of the northern sky, said to resemble a little horse. It lies west of the constellation Aquarius.
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| Eridanus |
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proper noun
- (constellation) A large winter constellation of the northern sky. It lies near Orion and Cetus.
- (greekmyth) A mythical river of northern Europe, rich in amber.
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| EROS |
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initialism
- w:Earth Resources Observation Satellite, Earth Resources Observation Satellite.
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| Europa |
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proper noun
- (greek mythology) A Phoenician princess abducted to Crete by Zeus.
- A moon of Jupiter.
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| evening star |
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noun
- The planet Venus as seen in the western sky in the evening.
- The evening star is the morning star. (Hesperus is Phosphorus.)
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| event horizon |
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noun
- (astronomy) The gravitational sphere of a black hole within which even light cannot escape, the gravity of which causing time to practically stop.
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| extinction |
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noun
- The action of making or becoming extinct; annihilation.
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| extragalactic |
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adjective
- (astronomy) outside the Milky Way system.
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| extrasolar |
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adjective - (astronomy) Of or originating in a solar system other than Earth, Earth's
- A four-inch telescope was once used to find an planet.
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