altitude


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Related to altitude: altitude sickness

altitude,

vertical distance of an object above some datum plane, such as mean sea levelsea level,
the level of the sea, which serves as the datum used for measurement of land elevations and ocean depths. Theoretically, one would expect sea level to be a fixed and permanent horizontal surface on the face of the earth, and as a starting approximation, this is true.
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 or a reference point on the earth's surface. It is usually measured by the reduction in atmospheric pressure with height, as shown on a barometerbarometer
, instrument for measuring atmospheric pressure. It was invented in 1643 by the Italian scientist Evangelista Torricelli, who used a column of water in a tube 34 ft (10.4 m) long.
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 or altimeteraltimeter
, device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear elevation as an airplane, balloon, or mountain climber rises.
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. In surveying and astronomy, it is the vertical angle of an observed point, such as a star or planet, above the horizon plane. The altitude of a feature of the earth's surface is usually called its elevationelevation,
vertical distance from a datum plane, usually mean sea level to a point above the earth. Often used synonymously with altitude, elevation is the height on the earth's surface and altitude, the height in space above the surface.
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. Recent spacecraft instrumentation has also measured vertical distances on the earth and other planets, determining the height of planetary features by means of radar and optical imaging.

In astronomy, altitude is the angular distance of a heavenly body above the astronomical horizon as determined by the angle which a line drawn from the eye of the observer to the heavenly body makes with the plane of the horizon. The reading of the apparent altitude, as determined by a telescope attached to a graduated circle, must be corrected for refraction by the atmosphere and for certain other effects to ascertain the true altitude. The altitude of the north celestial pole, which is approximately that of the star PolarisPolaris
or North Star,
star nearest the north celestial pole (see equatorial coordinate system). It is in the constellation Ursa Minor (see Ursa Major and Ursa Minor; Bayer designation Alpha Ursae Minoris) and marks the end of the handle of the Little Dipper.
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, is equal to the observer's latitude.

altitude

The angular distance of a point or celestial object above or below the horizon, or of an object, such as an artificial satellite, above mean sea level. Altitude and azimuth are coordinates in the horizontal coordinate system.

Altitude

(religion, spiritualism, and occult)

In astrology, altitude refers to the angular distance (i.e., measured in degrees of an arc) that a point, planet, or other heavenly body is situated above or below the horizon. Above the horizon, altitude is measured up to a maximum angular distance of 90° (directly overhead); below the horizon, down to a maximum of-90° (directly underneath).

Altitude

 

the angular displacement of an observed object, such as a flight vehicle or a celestial body, above the celestial horizon. In astronomy, altitude is used together with azimuth to determine the direction to an object in the horizon system of coordinates.

altitude

[′al·tə‚tüd]
Abbreviated alt.
(engineering)
Height, measured as distance along the extended earth's radius above a given datum, such as average sea level.
Angular displacement above the horizon measured by an altitude curve.
(mathematics)
The perpendicular distance from the base to the top (a vertex or parallel line) of a geometric figure such as a triangle or parallelogram.

altitude

altitudeclick for a larger image
altitude
Altitude (celestial).
.
i. The vertical distance of a level, a point, or an object considered as a point, measured from mean sea level (ICAO). In the case of aircraft in flight, it is normally expressed in flight levels or hundreds of feet. For example, an aircraft flying at 25,000 ft AMSL (above mean sea level) would be said to be flying at flight level 250. A barometric altimeter shows pressure altitude. When it is corrected for instrument errors and necessary compensation is made for variation from standard atmospheric conditions, it is called a true altitude. Absolute altitude is measured by a radio, radar, or laser altimeter. Absolute altitude is the true distance from the surface of the earth at that point. In some definitions, heights, which are the vertical distance of an object from an object, point, or level above ground or other reference plane, are also called altitude, such as in AGL (above ground level) altitude, MSL (mean seal level) altitude, and indicated altitude (that indicated by an altimeter).
ii. The angular displacement above the horizon; the arc of a vertical circle between the horizon and a point on the celestial sphere measured upward from the horizon from 0° to 90°. Angular displacement below the horizon is called negative altitude, or dip. See also computed altitude and density altitude.

altitude

1. Geometry the perpendicular distance from the vertex to the base of a geometrical figure or solid
2. Astronomy navigation the angular distance of a celestial body from the horizon measured along the vertical circle passing through the body
References in periodicals archive ?
Aspetar's altitude simulator is one of the four of its kind in the world.
Lisbon, Portugal, -- Altitude Software, the leading independent contact center solutions vendor, announces the availability of Altitude Health Monitor, a new application to keep the contact center infrastructure running by providing real time and historical data on overall system performance,over a friendly web interface and through email and SMS notifications.
Studies have shown that sea-level natives, or lowlanders, exhibit no change in diffusing capacity after living four weeks at high altitude (12,000 feet).
The expedition will last six weeks, from next Monday, and will include establishing a base camp laboratory at an altitude of 5,100 metres.
If you don't believe me, bring an altimeter into an altitude chamber; see what happens.
Although direct temperature data aren't available, the thinning of the air at high altitudes has been detected.
Due to the low elevation, builders of the Qinghai-Tibet railway breathed in so much nitrogen that they suffered from altitude sickness such as headaches and nausea.
USARIEM scientists are investigating the use of pre-exposure to high-altitude conditions to prevent altitude sickness to help Soldiers who need to make sudden and prolonged ascents to altitudes of 5,000 to 14,000 feet.
Because the rocket is launched at altitude, it takes advantage of higher performing and extremely simple nozzles, which can be optimized for the higher altitude condition," Walker said.
Once established at altitude in the warning area, the instructor put the T-34C through a stall series, a spin, and a series of other aerobatic maneuvers.