boundary horizon

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• Horizon (disambiguation) — Horizon is the line at which the sky and the earth s surface appear to meet.Horizon or horizons may also refer to:Business* Horizon Global, a corporation specializing in media compression technology, peer to peer video telephony, and video on… …   Wikipedia

• Horizon — Ho*ri zon, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?) the bounding line, horizon, fr. ? to bound, fr. ? boundary, limit.] 1. The line which bounds that part of the earth s surface visible to a spectator from a given point; the apparent junction of …   The Collaborative International Dictionary of English

• horizon — [hə rī′zən] n. [altered (after L) < ME orizont < OFr orizonte < L horizon < Gr horizōn (kyklos), the bounding (circle), horizon < prp. of horizein, to bound, limit < horos, boundary, limit, akin to L urvus, city boundary, orig …   English World dictionary

• horizon — late 14c., orisoun, from O.Fr. orizon (14c., Mod.Fr. horizon), earlier orizonte (13c.), from L. horizontem (nom. horizon), from Gk. horizon kyklos bounding circle, from horizein bound, limit, divide, separate, from horos boundary. The h was… …   Etymology dictionary

• horizon — [n] skyline, extent border, boundary, compass, field of vision, ken, limit, perspective, prospect, purview, range, reach, realm, scope, sphere, stretch, vista; concepts 484,509,529 …   New thesaurus

• boundary — [n] outer limit abuttals, ambit, barrier, beginning, border, borderland, borderline, bounds, brink, circumference, circumscription, compass, confines, edge, end, environs, extent, extremity, frame, fringe, frontier, hem, horizon, limits, line,… …   New thesaurus

• horizon — /heuh ruy zeuhn/, n. 1. the line or circle that forms the apparent boundary between earth and sky. 2. Astron. a. the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of… …   Universalium

• Horizon (general relativity) — There are several types of spacetime horizons that play a role in Einstein s theory of general relativity:* Absolute horizon, a boundary in spacetime in general relativity inside of which events cannot affect an external observer * Apparent… …   Wikipedia

• Horizon — For other uses, see Horizon (disambiguation). A water horizon, in northern Wisconsin, U.S. The horizon (or skyline) is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that… …   Wikipedia

• horizon — [14] Etymologically, the horizon is simply a ‘line forming a boundary’. The word comes via Old French orizon and late Latin horīzōn from Greek horízōn, a derivative of the verb horīzein ‘divide, separate’ (source also of English aphorism [16],… …   The Hutchinson dictionary of word origins

• horizon — [14] Etymologically, the horizon is simply a ‘line forming a boundary’. The word comes via Old French orizon and late Latin horīzōn from Greek horízōn, a derivative of the verb horīzein ‘divide, separate’ (source also of English aphorism [16],… …   Word origins