65 relations: A Greek–English Lexicon, A K Peters, Aconcagua, Aerial landscape art, Aircraft, Angular diameter, Atmospheric refraction, Brook Taylor, Burj Khalifa, Circle, Communication, Crow's nest, Dawn, Dusk, Earth, Earth ellipsoid, Earth radius, Field (mathematics), Fundamental plane (spherical coordinates), Greek language, Horizontal and vertical, Horizontal coordinate system, Horizontal plane, Hull-down, Imperial units, Incidence geometry, John Stillwell, Karl Georg Christian von Staudt, Kirsti Andersen, Landscape, Landscape painting, Limb, Limb darkening, Lockheed U-2, Lunar limb, Mars, Mercury (planet), Mile, Mimas (moon), Mirage, Moon, Mount Everest, Nautical mile, Parallel (geometry), Perseus Project, Perspective (graphical), Picture plane, Plane (geometry), Point at infinity, Projective geometry, ..., Pythagorean theorem, Radar, Radian, Radio, Refraction, Refractive index, Satellite, Sea level, Sextant, Sky, Spatial disorientation, Spherical Earth, Storey, Telegraphy, Visual flight rules. Expand index (15 more) »

## A Greek–English Lexicon

A Greek–English Lexicon, often referred to as Liddell & Scott, Liddell–Scott–Jones, or LSJ, is a standard lexicographical work of the Ancient Greek language.

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## A K Peters

A K Peters, Ltd. was a publisher of scientific and technical books, specializing in mathematics and in computer graphics, robotics, and other fields of computer science.

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## Aconcagua

Aconcagua is the highest mountain outside Asia, at, and the highest point in the Southern Hemisphere.

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## Aerial landscape art

Aerial landscape art includes paintings and other visual arts which depict or evoke the appearance of a landscape from a perspective above it—usually from a considerable distance—as it might be viewed from an aircraft or spacecraft.

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## Aircraft

An aircraft is a machine that is able to fly by gaining support from the air.

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## Angular diameter

The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.

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## Atmospheric refraction

Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height.

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## Brook Taylor

Brook Taylor (18 August 1685 – 29 December 1731) was an English mathematician who is best known for Taylor's theorem and the Taylor series.

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## Burj Khalifa

The Burj Khalifa (برج خليفة, Arabic for "Khalifa Tower"; pronounced), known as the Burj Dubai before its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates.

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## Circle

A circle is a simple closed shape.

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## Communication

Communication (from Latin commūnicāre, meaning "to share") is the act of conveying intended meanings from one entity or group to another through the use of mutually understood signs and semiotic rules.

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## Crow's nest

A crow's nest is a structure in the upper part of the main mast of a ship or a structure that is used as a lookout point.

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## Dawn

Dawn, from an Old English verb dagian: "to become day", is the time that marks the beginning of twilight before sunrise.

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## Dusk

Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before night.

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## Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

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## Earth ellipsoid

An Earth ellipsoid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences.

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## Earth radius

Earth radius is the approximate distance from Earth's center to its surface, about.

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## Field (mathematics)

In mathematics, a field is a set on which addition, subtraction, multiplication, and division are defined, and behave as when they are applied to rational and real numbers.

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## Fundamental plane (spherical coordinates)

The fundamental plane in a spherical coordinate system is a plane of reference that divides the sphere into two hemispheres.

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## Greek language

Greek (Modern Greek: ελληνικά, elliniká, "Greek", ελληνική γλώσσα, ellinikí glóssa, "Greek language") is an independent branch of the Indo-European family of languages, native to Greece and other parts of the Eastern Mediterranean and the Black Sea.

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## Horizontal and vertical

The usage of the inter-related terms horizontal and vertical as well as their symmetries and asymmetries vary with context (e.g. two vs. three dimensions or calculations using a flat earth approximation vs. spherical earth).

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## Horizontal coordinate system

The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane.

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## Horizontal plane

In geometry, physics, astronomy, geography, and related sciences, a plane is said to be horizontal at a given point if it is perpendicular to the gradient of the gravity field at that point – in other words, if apparent gravity makes a plumb bob hang perpendicular to the plane at that point.

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## Hull-down

In sailing and warfare, hull-down means that the upper part of a vessel or vehicle is visible, but the main, lower body (hull) is not; the term hull-up means that all of the body is visible.

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## Imperial units

The system of imperial units or the imperial system (also known as British Imperial or Exchequer Standards of 1825) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.

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## Incidence geometry

In mathematics, incidence geometry is the study of incidence structures.

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## John Stillwell

John Colin Stillwell (born 1942) is an Australian mathematician on the faculties of the University of San Francisco and Monash University.

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## Karl Georg Christian von Staudt

Karl Georg Christian von Staudt (24 January 1798 – 1 June 1867) was a German mathematician who used synthetic geometry to provide a foundation for arithmetic.

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## Kirsti Andersen

Kirsti Møller Andersen (born December 9, 1941, Copenhagen), published under the name Kirsti Pedersen, is a Danish historian of mathematics.

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## Landscape

A landscape is the visible features of an area of land, its landforms and how they integrate with natural or man-made features.

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## Landscape painting

Landscape painting, also known as landscape art, is the depiction of landscapes in art – natural scenery such as mountains, valleys, trees, rivers, and forests, especially where the main subject is a wide view – with its elements arranged into a coherent composition.

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## Limb

Limb can refer to.

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## Limb darkening

Limb darkening is an optical effect seen in stars (including the Sun), where the center part of the disk appears brighter than the edge or limb of the image.

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## Lockheed U-2

The Lockheed U-2, nicknamed "Dragon Lady", is an American single-jet engine, ultra-high altitude reconnaissance aircraft operated by the United States Air Force (USAF) and previously flown by the Central Intelligence Agency (CIA).

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## Lunar limb

The lunar limb is the edge of the visible surface (disc) of the Moon as viewed from Earth.

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## Mars

Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.

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## Mercury (planet)

Mercury is the smallest and innermost planet in the Solar System.

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## Mile

The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.

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## Mimas (moon)

Mimas, also designated Saturn I, is a moon of Saturn which was discovered in 1789 by William Herschel.

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## Mirage

A mirage is a naturally occurring optical phenomenon in which light rays bend to produce a displaced image of distant objects or the sky.

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## Moon

The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.

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## Mount Everest

Mount Everest, known in Nepali as Sagarmāthā and in Tibetan as Chomolungma, is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas.

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## Nautical mile

A nautical mile is a unit of measurement defined as exactly.

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## Parallel (geometry)

In geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel.

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## Perseus Project

The Perseus Project (version 4 also known as "Perseus Hopper") is a digital library project of Tufts University, which is located in Medford and Somerville, near Boston, in the U.S. state of Massachusetts.

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## Perspective (graphical)

Perspective (from perspicere "to see through") in the graphic arts is an approximate representation, generally on a flat surface (such as paper), of an image as it is seen by the eye.

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## Picture plane

In painting, photography, graphical perspective and descriptive geometry, a picture plane is an image plane located between the "eye point" (or oculus) and the object being viewed and is usually coextensive to the material surface of the work.

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## Plane (geometry)

In mathematics, a plane is a flat, two-dimensional surface that extends infinitely far.

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## Point at infinity

In geometry, a point at infinity or ideal point is an idealized limiting point at the "end" of each line.

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## Projective geometry

Projective geometry is a topic in mathematics.

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## Pythagorean theorem

In mathematics, the Pythagorean theorem, also known as Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle.

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## Radar

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.

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## Radian

The radian (SI symbol rad) is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics.

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## Radio

Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.

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## Refraction

Refraction is the change in direction of wave propagation due to a change in its transmission medium.

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## Refractive index

In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how light propagates through that medium.

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## Satellite

In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.

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## Sea level

Mean sea level (MSL) (often shortened to sea level) is an average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured.

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## Sextant

A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects.

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## Sky

The sky (or celestial dome) is everything that lies above the surface of the Earth, including the atmosphere and outer space.

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## Spatial disorientation

Spatial disorientation, spatial unawareness is the inability of a person to correctly determine his/her body position in space.

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## Spherical Earth

The earliest reliably documented mention of the spherical Earth concept dates from around the 6th century BC when it appeared in ancient Greek philosophy but remained a matter of speculation until the 3rd century BC, when Hellenistic astronomy established the spherical shape of the Earth as a physical given.

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## Storey

A storey (British English) or story (American English) is any level part of a building with a floor that could be used by people (for living, work, storage, recreation).

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## Telegraphy

Telegraphy (from Greek: τῆλε têle, "at a distance" and γράφειν gráphein, "to write") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message.

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## Visual flight rules

Visual flight rules (VFR) are a set of regulations under which a pilot operates an aircraft in weather conditions generally clear enough to allow the pilot to see where the aircraft is going.

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## Redirects here:

Horizen, Horizon distance, Offing, Offings, The horizon.

## References

[1] https://en.wikipedia.org/wiki/Horizon