horizon

ho·ri·zon

H0277300 (hə-rī′zən)n.1. The apparent intersection of the earth and sky as seen by an observer. Also called apparent horizon.2. Astronomy a. See sensible horizon.b. See celestial horizon.c. The limit or edge of the observable universe.3. The range of one's knowledge, experience, or interest.4. Geology a. A specific position in a column of rock layers, usually designated by the occurrence of one or more distinctive fossils or by a distinctive sediment bed, that is used in stratigraphy.b. A layer of soil that can be distinguished from adjacent layers of soil and that is characterized by a certain color, texture, structure or chemical composition.5. Archaeology A period during which the influence of a specified culture spread rapidly over a defined area: artifacts associated with the Olmec horizon in Mesoamerica.

[Middle English orizon, from Old French, from Latin horizōn, from Greek horizōn (kuklos), limiting (circle), horizon, present participle of horizein, to limit, from horos, boundary.]

horizon

(həˈraɪzən) n1. (Physical Geography) Also called: visible horizon or apparent horizon the apparent line that divides the earth and the sky2. (Astronomy) astronomy a. Also called: sensible horizon the circular intersection with the celestial sphere of the plane tangential to the earth at the position of the observerb. Also called: celestial horizon the great circle on the celestial sphere, the plane of which passes through the centre of the earth and is parallel to the sensible horizon3. the range or limit of scope, interest, knowledge, etc4. (Geological Science) a thin layer of rock within a stratum that has a distinct composition, esp of fossils, by which the stratum may be dated5. (Physical Geography) a layer in a soil profile having particular characteristics. See A horizon, B horizon, C horizon6. on the horizon likely or about to happen or appear[C14: from Latin, from Greek horizōn kuklos limiting circle, from horizein to limit, from horos limit] hoˈrizonless adj

ho•ri•zon

(həˈraɪ zən)

n. 1. the line or circle that forms the apparent boundary between earth and sky. 2. 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 such a circle (sensible horizon). b. the great circle of the celestial sphere whose plane passes through the center of the earth and is parallel to the sensible horizon of a given position, or the plane of such a circle (celestial horizon). 3. the limit or range of perception, knowledge, or the like. 4. Usu., horizons. the scope of a person's interest, education, understanding, etc. 5. a thin, distinctive geological stratum useful for stratigraphic correlation. 6. any of the series of distinctive layers found in a vertical cross section of any well-developed soil. [1540–50; < Latin horizōn < Greek horízōn(kýklos) bounding (circle), present participle of horízein to bound, limit]

ho·ri·zon

(hə-rī′zən) The circle on the celestial sphere along which the Earth and the sky appear to meet.

horizon

In general, the apparent or visible junction of the Earth and sky, as seen from any specific position. Also called the apparent, visible, or local horizon. A horizontal plane passing through a point of vision or perspective center. The apparent or visible horizon approximates the true horizon only when the point of vision is very close to sea level.

Thesaurus

Noun	1.	horizon - the line at which the sky and Earth appear to meetapparent horizon, sensible horizon, visible horizon, skylinelinear perspective, perspective - the appearance of things relative to one another as determined by their distance from the viewerline - a spatial location defined by a real or imaginary unidimensional extent
	2.	horizon - the range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge"purview, viewambit, range, scope, reach, compass, orbit - an area in which something acts or operates or has power or control: "the range of a supersonic jet"; "a piano has a greater range than the human voice"; "the ambit of municipal legislation"; "within the compass of this article"; "within the scope of an investigation"; "outside the reach of the law"; "in the political orbit of a world power"
	3.	horizon - a specific layer or stratum of soil or subsoil in a vertical cross section of landprofile - a vertical section of the Earth's crust showing the different horizons or layersstratum - one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)soil horizon - a layer in a soil profilegeological horizon - a layer of rock with a particular composition (especially of fossils); for dating the stratum
	4.	horizon - the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earthcelestial horizongreat circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center

horizon

noun1. skyline, view, vista, field or range of vision The sun had already sunk below the horizon.2. scope, perspective, range, prospect, stretch, ken, sphere, realm, compass, ambit, purview By embracing other cultures, we actually broaden our horizons.

horizon

nounThe extent of one's perception, understanding, knowledge, or vision:ken, purview, range, reach, scope.

Translations

地平线

horizon

(həˈraizn) noun the line at which the earth and the sky seem to meet. The sun went down below the horizon; A ship could be seen on the horizon.地平线horizontal (horiˈzontl) adjective at right angles to vertical; parallel to the horizon; lying level or flat. a horizontal line; a horizontal surface. 地平的，水平的 ˌhoriˈzontally adverb 水平地，横地

horizon

→ 地平线zhCN

horizon

horizon,

in astronomy, roughly circular line bounding an observer's view of the surface of the earth where the sky and earth seem to meet. This is the visible horizon. At sea the visible horizon is a perfect circle with the observer at its center, but on land it is irregular due to topographic features. The distance to the horizon varies as the square root of the observer's elevation for small elevations; at four times the height the distance to the horizon is twice as great. The celestial horizoncelestial horizon,
one axis of the altazimuth coordinate system. It is the great circle on the celestial sphere midway between the observer's zenith and nadir; it divides the celestial sphere into two equal hemispheres.
..... Click the link for more information. , the principal axis in the altazimuth coordinate systemaltazimuth coordinate system
or horizon coordinate system,
astronomical coordinate system in which the position of a body on the celestial sphere is described relative to an observer's celestial horizon and zenith.
..... Click the link for more information. , lies halfway between the observer's zenithzenith,
in astronomy, the point in the sky directly overhead; more precisely, it is the point at which the celestial sphere is intersected by an upward extension of a plumb line from the observer's location.
..... Click the link for more information. and nadirnadir
[Arab.,=opposite], in astronomy, the point on the celestial sphere directly opposite the zenith, i.e., directly beneath the observer.
..... Click the link for more information. . In geology horizon refers to sedimentary deposits of a certain period, usually marked by characteristic fossils.

horizon

1. The horizontal plane perpendicular to a line through an observer's position and his or her zenith. The great circle in which an observer's horizon meets the celestial sphere is called the astronomical horizon, or simply the horizon; it separates the visible half of the celestial sphere from the invisible half for that observer or position. See also cardinal points. 2. See event horizon. 3. See horizon distance.

Horizon

(religion, spiritualism, and occult)

The term horizon has the same meaning in astrology as in other contexts, although in astrological practice it usually refers only to the eastern and western horizons. Extended out into space and projected against the background of the stars, the eastern horizon is referred to as the ascendant, which is the same as the cusp of the first house. Similarly, the western horizon projected against the background of the stars is the descendant, which is also the cusp of the seventh house. A distinction can be made between the tropocentric horizon, which is the horizon from a particular spot on the surface of Earth, and the geocentric horizon, which is a “horizon” created by drawing through the middle of Earth an imaginary line (or great circle) that is parallel to the tropocentric horizon. When extended out into space, the geocentric horizon is called the rational horizon. For most astrological work, the difference between the tropocentric horizon and the geocentric horizon is insignificant.

Sources:

Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New York: New American Library, 1980.Filbey, John, and Peter Filbey. The Astrologer’s Companion. Wellingborough, Northamptonshire, UK: Aquarian Press, 1986.

Horizon

the part of the earth’s surface that is visible to the eye of an observer on open terrain. The line along which the sky appears to be contiguous with the earth’s surface is called the visible horizon (see Figure 1). The distance d of the visible horizon, that is, the distance to the most distant visible points of the earth’s surface, depends on the altitude h of the observer’s location above the level of the surrounding terrain and on the relief of the terrain (at sea it depends on the elevation above sea level); it is expressed by the formula d (in (the mean refraction is taken into account in the formula). With an increase in altitude h the distance of the visible horizon increases (see Table 1).

Figure 1. Horizon: ABC is the visible horizon: MM is the plane of the true horizon

The true, or mathematical, horizon is a large circle of the celestial sphere whose plane is perpendicular to a plumb line. The visible horizon usually lies lower than the true horizon, and the angle δ between them is called the lowering of the horizon.

Table 1. The visible horizon in terms of height and distance
h(m)	d(km)	h(m)	d(km)	h(m)	d(km)
1	3.8	9	11.5	80	34.3
2	5.4	10	12.1	90	36.3
3	6.6	20	17.1	100	38.3
4	7.7	30	21.0	200	54.2
5	8.6	40	24.2	300	66.3
6	9.4	50	27.1	400	76.6
7	10.1	60	29.7	500	85.6
8	10.8	70	32.0	600	93.8

The meridian of the place of observation intersects the true horizon at north and south points. Between them on the horizon lie the east point (to the right of the observer who stands facing north) and the west point (to his left). At the east and west points the horizon intersects with the celestial equator. The points north, east, south, and west are called the main points of the horizon.

N. P. ERPYLEV [7–23l–1]

Horizon

in geology, a local stratigraphic subdivision corresponding to a level or sublevel of the generally accepted stratigraphic scale. It includes rocks of the same age with varied lithological composition, sometimes with a definite set of fauna (for example, the Chokrak horizon of the Neocene in the Crimean and Caucasian area). Sometimes the term “horizon” is used to designate a patch of layers of little thickness with distinctive lithological or paleontological features that is well-traced along its course (for example, a horizon with silicic concretions, a coral horizon).

Horizon

a research ship of the Scripps Institution of Oceanography of the University of California (USA).

The Horizon was built in 1944. It is 43.6 m long and 10 m wide, with a 900-ton displacement and a top speed of 25 km per hour. It can cruise autonomously for 48 days, with a range of about 13,000 km. It is equipped with sounding devices, two hydrographic winches, a trawl winch, a bathythermographic winch, and a scientific laboratory. The Horizon was designed for meteorologic and all types of oceanographic observations; it has been used to investigate various regions of the Pacific Ocean. In 1952–53 an expedition on the Horizon discovered the Tonga trough, the greatest depth known to that time (10,633 m).

horizon

[hə′rīz·ən] (astronomy) The apparent boundary line between the sky and the earth or sea. Also known as apparent horizon. The distance a light-ray could have traveled since the big-bang explosion at any given epoch in the evolution of the universe. (geology) The surface separating two beds. One of the layers, each of which is a few inches to a foot thick, that make up a soil.

horizon

The apparent or visible junction of the earth and sky, as seen from any specific position.

horizon

i. In general, the apparent or visible junction of the earth and sky, as seen from any specific position. Also called a visible or local horizon.
ii. When an apparent boundary is modified by refraction, terrain, or other factors, it is called an apparent horizon.
iii. A small circle on the celestial sphere, the plane of which passes through the observer's eye and is parallel to the observer's rational horizon, is called a sensible horizon.
iv. A path followed by a radar beam when it is tangential to earth is a radar horizon.
v. The locus of the point at which direct rays from a terrestrial radio transmitter become tangential to the earth is a radio horizon.
vi. A line resembling the visible horizon but above or below it is called a false horizon.
vii. An artificial horizon is a gyroscopic instrument for indicating the attitude of an aircraft with respect to the horizontal. See artificial horizon.

horizon

1. the apparent line that divides the earth and the sky 2. Astronomya. the circular intersection with the celestial sphere of the plane tangential to the earth at the position of the observer b. the great circle on the celestial sphere, the plane of which passes through the centre of the earth and is parallel to the sensible horizon 3. a thin layer of rock within a stratum that has a distinct composition, esp of fossils, by which the stratum may be dated 4. a layer in a soil profile having particular characteristics

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a (small) cloud on the hoˈrizon

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Synonyms for horizon

noun skyline

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noun scope

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Synonyms for horizon

noun the extent of one's perception, understanding, knowledge, or vision

Synonyms

Synonyms for horizon

noun the line at which the sky and Earth appear to meet

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Related Words

noun the range of interest or activity that can be anticipated

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

Related Words

noun the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth

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