What is "horizon"

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 earth and sky.

   And when the morning sun shall raise his car Above the border of this horizon.
   --Shak.

   All the horizon round Invested with bright rays.
   --Milton.

2. (Astron.)

   1. A plane passing through the eye of the spectator and at right angles to the vertical at a given place; a plane tangent to the earth's surface at that place; called distinctively the sensible horizon.

   2. A plane parallel to the sensible horizon of a place, and passing through the earth's center; -- called also rational horizon or celestial horizon.

   3. (Naut.) The unbroken line separating sky and water, as seen by an eye at a given elevation, no land being visible.

3. (Geol.) The epoch or time during which a deposit was made.

   The strata all over the earth, which were formed at the same time, are said to belong to the same geological horizon.
   --Le Conte.

4. (Painting) The chief horizontal line in a picture of any sort, which determines in the picture the height of the eye of the spectator; in an extended landscape, the representation of the natural horizon corresponds with this line.

5. The limit of a person's range of perception, capabilities, or experience; as, children raised in the inner city have limited horizons.

6. [fig.] A boundary point or line, or a time point, beyond which new knowledge or experiences may be found; as, more powerful computers are just over the horizon.

   Apparent horizon. See under Apparent.

   Artificial horizon, a level mirror, as the surface of mercury in a shallow vessel, or a plane reflector adjusted to the true level artificially; -- used chiefly with the sextant for observing the double altitude of a celestial body.

   Celestial horizon. (Astron.) See def. 2, above.

   Dip of the horizon (Astron.), the vertical angle between the sensible horizon and a line to the visible horizon, the latter always being below the former.

   Rational horizon, and Sensible horizon. (Astron.) See def. 2, above.

   Visible horizon. See definitions 1 and 2, above.

late 14c., orisoun, from Old French orizon (14c., Modern French horizon), earlier orizonte (13c.), from Latin horizontem (nominative horizon), from Greek horizon kyklos "bounding circle," from horizein "bound, limit, divide, separate," from horos "boundary." The h- was restored 17c. in imitation of Latin. Old English used eaggemearc ("eye-mark") for "limit of view, horizon."

n. 1 The horizontal line that appears to separate the Earth from the sky. 2 The range or limit of one's knowledge, experience or interest. 3 (context geology English) A specific layer of soil or strata 4 (context archaeology US English) A cultural sub-period or level within a more encompassing time period.

1. n. the line at which the sky and Earth appear to meet [syn: apparent horizon, visible horizon, sensible horizon, skyline]

2. the range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge" [syn: view, purview]

3. a specific layer or stratum of soil or subsoil in a vertical cross section of land

4. the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth [syn: celestial horizon]

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 intersect the Earth's surface, and those that do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the visible horizon. When looking at a sea from a shore, the part of the sea closest to the horizon is called the offing. The word horizon derives from the Greek "ὁρίζων κύκλος" horizōn kyklos, "separating circle", from the verb ὁρίζω horizō, "to divide", "to separate", and that from "ὅρος" (oros), "boundary, landmark".

Horizon is an ongoing and long-running British documentary television series on BBC that covers science and philosophy.

The Horizon is a mechanical swing-lens panoramic camera. It is manufactured by Krasnogorsky Mechanicheskiy Zavod (KMZ) in Krasnogorsk, Russia, better-known for their range of Zenit cameras. The main characteristic of this camera is its rotating lens that takes in a 120° panorama as the shutter button is pressed. The current (2015) models label as Horizon Perfekt and Horizon Kompakt.

Horizon is the line at which the sky and the Earth's surface appear to meet.

Horizon or horizons may also refer to:

Horizon (styled as HORIZON) is pop/ rock group Remioromen's third full-length album, released on May 17, 2006. The disc contains 12 songs.

Horizon is a current events television program produced by KAET in Phoenix, Arizona. It is one of the two locally produced news programs for KAET, the other being its sister program, Horizonte.

Horizon was German group Culture Beat's first album. It was released on March 8, 1991 by Dance Pool. The album featured their first hit, No Deeper Meaning, which reached No. 5 in the Netherlands.

"Horizon" is the twentieth episode of the second season of the science fiction television series Star Trek: Enterprise, and originally aired on April 16, 2003 on UPN. The episode was written by André Bormanis, and directed by James A. Contner. The episodes guest stars included Nicole Forester, who had previously appeared in Star Trek: Deep Space Nine, Joan Pringle and Corey Mendell Parker.

Set in the 22nd century, the series follows the adventures of the first Starfleet starship Enterprise, registration NX-01. When the ship detours to observe volcanic activity on a planet, Ensign Mayweather ( Anthony Montgomery) takes the opportunity to visit his family on board the E.C.S. Horizon.

Montgomery had previously suggested the appearance of Mayweather's parents at the end of season one, and was pleased to see them introduced. Several sets to create the Horizon were created on a soundstage, with the related scenes filmed in the second half of the episode's shoot after the main cast were dismissed, with the exception of Montgomery. Critical response was mixed, and the episode received the lowest ratings for a first-run episode of the series so far, viewed by 3.36 million viewers.

In archaeology, a horizon is a distinctive type of sediment, artefact, style or other cultural trait that is found across a large geographical area.

The term is used to denote a series of stratigraphic relationships that constitute a phase, or are part of the process of determining the archaeological phases of a site. An archaeological horizon can be understood as a break in contexts formed in the Harris matrix, which denotes a change in epoch on a given site by delineation in time of finds found within contexts.

An example of a horizon is the Dark earth horizon in England, which separates Roman artefacts from medieval artefacts and which may indicate the abandonment of urban areas in Roman Britain during the 2nd to 5th centuries. The term is also frequently used in the archaeology of Pre-Columbian America.

The term 'Archaeological horizon' is sometimes, and somewhat incorrectly, used in place of the term layer or strata.

Horizon is the sixth consecutive platinum-certified album by American musical duo Carpenters. It was recorded at A&M Studios (mainly in Studio "D" using then-state-of-the-art 24-track recording technology, 30 Dolby, and recorded at 30 inches per second). The Carpenters spent many hours experimenting with different sounds, techniques and effects.

After five consecutive albums peaking inside the US top five, Horizon broke this run by reaching no. 13. The album has been certified Platinum by the RIAA for shipments of 1 million copies. It was particularly successful in the United Kingdom and Japan, topping the charts and becoming one of the best-selling albums of 1975 in those countries. Horizon also reached no. 3 in New Zealand, no. 4 in Canada and no. 5 in Norway.

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 horizon, a surface defined in general relativity
• Cauchy horizon, a surface found in the study of Cauchy problems
• Cosmological horizon, a limit of observability
• Event horizon, a boundary in spacetime beyond which events cannot affect the observer
• Killing horizon, a null surface on which there is a Killing vector field
• Particle horizon, the maximum distance from which particles can have travelled to an observer in the age of the universe

Horizon: A Review of Literature and Art was an influential literary magazine published in London, UK, between 1940 and 1949. It was edited by Cyril Connolly, who made it into a platform for a wide range of distinguished and emerging writers. It had a print run of 120 issues or 20 volumes.

Connolly founded Horizon with Peter Watson as its financial backer and de facto art editor. Connolly was editor throughout its publication and Stephen Spender was an uncredited associate editor until early 1941. It had a small circulation of around 9,500, but an impressive list of contributors, and it made a significant impact on the arts during and just after the World War II. Connolly issued an all-Irish number in 1941, an all-Swiss number in 1946 and a U. S. number in October 1947. There was also a French issue and one comprising The Loved One, the novel by Evelyn Waugh.

In Unconditional Surrender Evelyn Waugh created a character, Everard Spruce, who, like Connolly, was the editor of a literary review, liked good food and parties, and was surrounded by helpful young ladies. In reality two of these ladies at Horizon were Clarissa Eden and Sonia Brownell. Brownell met George Orwell through the magazine and later married him.

Horizon was a magazine published in the United States from 1958 to 1989. Originally published by American Heritage as a bi-monthly hardback, Horizon was subtitled A Magazine of the Arts. In 1978, Boone Inc. bought the magazine, which continued to cover the arts. Publication ceased in March 1989. Recently, American Heritage announced its intention to digitize essays from past issues.

Horizon is a recording by the jazz musician Sun Ra and his Astro-Intergalactic-Infinity Arkestra, forming part of the documentation of their first visit to Egypt.

It was recorded at the Ballon Theatre, Cairo.

In various editions, the record has sometimes been known by the other title of "Starwatchers"

Horizon is a fantasy novel by Lois McMaster Bujold. It is the fourth in the tetralogy The Sharing Knife.

Horizon is a 1979 album by jazz pianist McCoy Tyner released on the Milestone label. It was recorded in April 1979 and features performances by Tyner with Joe Ford, George Adams, John Blake, Charles Fambrough, Al Foster and Guilherme Franco.

Horizon is the sixth studio album of country artist Eddie Rabbitt. It was released in 1980 under the Elektra Records label. The album produced two singles, both of which reached number one on country charts. The lead-off single " Drivin' My Life Away" reached number 5 on the Billboard 100 and 9 the Adult Contemporary chart. The other single, " I Love a Rainy Night" reached number one on all three charts, the only single in Rabbitt's career to ever do so.

Horizon reached number one on country album charts and ultimately reached platinum status. Allmusic gave the album 4.5 stars out of 5 and praised the tracks on side one for their "sun-inspired, guitar-based productions, heavy on the echo" but described second side as being "a bit ballad-heavy." The review described the album as a " rockabilly release". In 2009, the full album was released in CD format.

The Horizon is a single-level model of rail car used by Amtrak, primarily on short-haul corridor routes in the Midwestern United States. Bombardier Transportation built 104 of the cars in 1988–1989 based on the Comet II commuter coach design.

Horizon was a Canadian current affairs television series which aired on CBC Television from 1963 to 1964.

Horizon is a Hungarian film directed by Pál Gábor. It was released in 1971.

Horizon was a German progressive metal/ power metal band.

In geology, a horizon refers to either a bedding surface where there is marked change in the lithology within a sequence of sedimentary or volcanic rocks, or a distinctive layer or thin bed with a characteristic lithology or fossil content within a sequence. In the interpretation of seismic reflection data, horizons are the reflectors (or seismic events) picked on individual profiles. These reflectors represent a change in rock properties across a boundary between two layers of rock, particularly seismic velocity and density.

Horizon is the annual science and technology festival of Indira Gandhi Institute of Technology, Sarang. Horizon hosts a variety of events including competitions, exhibitions, lectures and workshops. Horizon aims to provide technically inclined Indian youth a national-level platform where their talent and expertise can be recognized and rewarded. Having grown rapidly since its nascent years, Horizon is attended by students across India.

Horizon is the name for a computer system used by part of the United Kingdom's postal service, Post Office Ltd. It has come under criticism since at least 2013 for errors in the system which, according to press reports, may have caused the loss of dozens of jobs, unnecessary prison sentences, bankruptcies and one documented suicide. The system is used by at least 11,500 branches, and processes six million transactions every day.

Horizon is an online-only, open-access magazine covering research and innovation, published in Brussels since 2013 by the European Commission. It covers a wide range of topics, including agriculture, energy, environment, frontier research, health, ICT, industry, policy, science in society, security, social sciences, space and transport.

Horizon publishes three to five articles per week and in English only and normally covers research projects which were funded by the European Union (EU) through its Framework Programmes for Research and Technological Development, such as FP7 and Horizon 2020, and through the European Research Council. Occasionally, Horizon also publishes policy announcements from the European Commission’s Directorate-General for Research and Innovation.

Articles from Horizon Magazine can be republished under a license which requires simple attribution. Horizon articles have been shared or re-published, among others, by the European Space Agency, by the University of Oxford, by the Hebrew University of Jerusalem, by the University of Trento and by the Welfare State Futures Coordination Office at Humboldt University of Berlin and by the BBC's The Naked Scientists podcast.

Horizon is produced, on the European Commission’s behalf, by ICF Mostra, a Brussels-based communications division of ICF International.