Altitude
For other uses see Altitude (disambiguation)
Altitude is the elevation of an object from a known level or datum. Common datums are mean sea level and the surface of the WGS-84 geoid, used by GPS.
Altitude
The horizonal coordinate system depends on the location of the observer and the time of the observation. The altitude measures the angle of the object above or below the observer's horizon.
Altitude-Azimuth Coordinates
The conversions from H and to ( )- coordinates for an observer at latitude L are
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Altitude
This NASA weather balloon carries instruments that will measure temperature, pressure and wind speeds high above the ground. Image Credit: NASA
the height of something above the ground ...
The altitude at which the shuttle orbits depends on its mission. When the Shuttle docks with Mir, it goes up to 390 km (242 statute miles). Columbia, the oldest and heaviest shuttle in the fleet, can't reach that orbit.
Altitude. The angular distance from the observer's horizon, usually taken to be that horizon that is unobstructed by natural or artificial features (such as mountains or buildings), measured directly up from the horizon toward the zenith; ...
Altitude bearings
Wooden pattern was made in May for altitude bearings. Single pattern could be used for both sides because diameter piece can be flipped around:
Then we started to try to cast them at Doug's "foundry": ...
Altitude is your height above sea level. Right?
Ah, sort of right.
Unfortunately, astronomers use the word - altitude - to mean something different.
altitude -- the angle (in degrees) above the level horizon where an object in the sky appears. (The object's azimuth is also needed to pinpoint its position.) ...
altitude (of the sun): {elevation} [a, ALT] the angular distance of the (centre of) the sun's disk above the observer's horizon (negative values indicate that the sun is below the horizon).
Altitude The angular elevation of an object above or below the horizon.
Angular diameter The apparent diameter of an object measured in degrees or radians.
Altitude is the angle between the object you are looking at and your horizon.
Altitude
angle in degrees above the horizon.
Angstrom
abbreviated Å. A unit of length equal to 10-8 cm (one-hundredth of a millionth of a centimeter). An Angstrom is on the order of the size of an atom.
Altitude - The angular distance between the direction to an object and the horizon. Altitude ranges from 0 degrees for an object on the horizon to 90 degrees for an object directly overhead ...
Altitude The angle of a body above or below the plane of the horizon - negative altitudes are below the horizon.
altitude
The height in degrees than an object is above the horizon an a given location. Zero degrees is at the horizon while 90 degrees is overhead.
...
Altitude (Alt). The measurement of an object's angle, in degrees, above the horizon. Part of the horizontal system of co-ordinates.
Altitude varies from 0 to 90°. Vertical position of object.
Azimuth varies from 0° to 360°. Exact N = 0°, exact E = 90°, exact S = 180°, exact W = 270°. Horizontal position of object.
Altitude sickness, also known as acute mountain sickness , altitude illness, or soroche, is a pathological condition that is caused by acute exposure to low air pressure ....
Altitude-Azimuth
(a) Comprising a means of measuring or precisely locating in coordinates the position of objects at any altitude or azimuth. The term is now used mainly to describe a type of mounting for a telescope. (also Alt-Az) ...
. High altitude ozone is destroyed by the presence of chlorine, and recently attention has been drawn to ozone removal by chlorine produced by escaping refrigerant gases, of the types preferred until recently for use in air conditioners, ...
Altitude & Azimuth Calculator
Animations -- seasons, moon phases & more
Aphelion & Perihelion -- dates & times ...
altitude
1. the height above sea level
2. the angle between an object's position on the celestial sphere and the horizon
angular size ...
altitude
Astronomy
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Altitude-azimuth
A type of telescope mounting that supports the weight of the telescope and allows it to move in two directions to locate a specific target.
Altitude
The angular distance of an object above the horizon.
Antimatter
Matter consisting of particles with charges opposite that of ordinary matter. In antimatter, protons have a negative charge while electrons have a positive charge.
Altitude measurements from the LOLA instrument. Image: NASA's Goddard Space Flight Center.
The altitudes at which these bodies are visibly presented to us differ in individual cases. More than a thousand observations in duplicate have been made of the paths of identical meteors seen from two stations many miles apart.
At an altitude of 35,800 kilometers (22,200 miles), a satellite travels at a more modest 11,100 kilometers per hour, completing one orbit every 24 hours. It keeps pace with the Earth's rotation.
At an altitude of roughly 15,000 meters, the astronauts would deploy a 2.4 meter drogue chute from the rendezvous and recovery section. At 3230 meters altitude, the crew released the drogue which extracts the 5.5 meter pilot parachute.
The low-altitude portion of the orbit would have been used for remote sensing of the lower atmosphere and surface, and for direct measurements of upper atmosphere and ionosphere.
At high altitudes, there is less atmosphere to absorb infrared energy, which reveals details about some of the coldest objects in the universe, such as clouds of gas and dust and the disks of dust that give birth to planets.
Above an altitude of 100 kilometres, the structure of the atmosphere is determined by the onset of diffusive separation of atmospheric molecules.
The High-altitude airship (HAA) is an unmanned, long-duration, lighter-than-air vehicle using helium gas for lift, and thin-film solar cells for power.
Why do the altitude and azimuth of celestial bodies change?
How is azimuth measured in the altazimuth coordinate system of the horizon coordinate system?
How is altitude measured in the altazimuth or horizon coordinate system?
The air at altitudes above or below the jet stream may be calm and flowing steadily in one direction, but the jet stream does not always flow the same path as the surrounding airflow.
At 12 meters altitude the 2.4 m/s terminal descent phase was to begin. Engine shutoff would occur when one of the landing legs touched the ground. The horizontal landing velocity would be less than 2.4 m/s vertical and 1 m/s horizontal.
mirror altitude The altitude above the earth at which electrically charged corpuscular radiation impinging upon the earth is reflected by the geomagnetic field. mirror ratio See magnetic mirror. mirror reflection = specular reflection.
Alt-azimuth - Altitude-Azimuth. A telescope that moves in two axes, one left-to-right around a turntable base, and one up and down. Any part of the sky can be located with movement in these two axes.
For example, at an altitude of 1,730 kilometres the orbital velocity is 25,400 kilometres per hour and the period is two hours. At 35,700 kilometres the velocity is 11,300 kilometres per hour and the period 24 hours.
By flying in hight altitude (Stratosphere) less water vapour will be between the telescope and space leading to a smaller IR absorption of the atmosphere.
almucantar (NASA SP-7, 1965) = parallel of altitude. Aloha system (NASA Thesaurus) A multiple random access communications scheme in which there is a nonfixed allocation of channel capacity, ...
A daytime layer of the earth's IONOSPHERE approximately 50 to 90 km in altitude. DARK SURGE ON DISK (DSD). Dark gaseous ejections visible in H-ALPHA. DIFFERENTIAL ROTATION. The change in SOLAR ROTATION RATE with latitude.
Such an orbit has an altitude of about 35,900 km (22,300 miles).
Hertz Abbreviated Hz. A unit of frequency equal to one cycle per second. One kHz = 1000 Hz. One MHz = 106 (one million) Hz. One GHz = 109 Hz.
albedo surface reflectivity altitude the angular distance of an object above or below the horizon angstrom (Å) commonly used to measure the wavelength of light; ...
instrument for measuring the altitude of the sun or another celestial body; such measurements can then be used to determine the observer's geographical position or for other navigational, surveying, or astronomical applications.
The pressure of an atmosphere decreases with altitude due to the diminishing mass of gas above each location.
However, the periapsis altitude of Magellan's orbit was lowered, by the use of propulsive maneuvers, into the upper reaches of Venus's atmosphere near 140 km above the surface. This is still high above the cloudtops, which are at about 70 km.
Venus's troposphere extends up to an altitude of nearly 100 km. The reflective clouds that block our view of the surface lie between 50 and 70 km above the surface.
Balloon flights can carry instruments to altitudes of up to 40 kilometers above sea level, where they are above as much as 99.997% of the Earth's atmosphere.
Heating begins at an altitude of 100-120 km when a meteoroid encounters the Earth's atmosphere. An object's chance of survival depends on its initial mass, speed and angle of entry, and friability (tendency to break up).
Immediately evident are its brightness, its size, and its very low altitude as seen from Toronto.
As Armstrong flew the ship Aldrin called out the numbers, altitude, speed, fuel. There was nowhere to land. Armstrong pitched the Eagle to the left and spotted a site where the boulders thinned out. Eagle only had 90 seconds of fuel left.
Due to the shuttle's altitude when the incident occurred, no one on Earth or the shuttle was aware of the severity of the damage to Columbia. The insulation struck the shuttle on the front edge of the left wing.
Because the density of air diminishes gradually with increasing altitude, the air in the upper atmosphere is so thin that it merges almost imperceptibly with space.
The Big Ear could be aimed in altitude but not in azimuth, but it was intended as a survey instrument and that wasn't a major limitation.
They are at high altitude therefore above a lot of the local weather and atmosphere. They are also either on the west coast of continents or on mid-ocean islands. This is no coincidence.
In the infrared image of Uranus shown below (left), the different colors represent different altitudes in atmosphere. Because Uranus basically spins on its side, its polar regions receive more energy input from the Sun than do its equatorial regions.
NASA's probe passed by Callisto at an altitude of just 138 km (86 miles), making its closest approach on May 25 this year.
A joint United States-European project, ALMA will consist of at least sixty-four 12-meter dish antennas at an altitude of 5,000 m near Cerro Chajnantor in northern Chile.
 See also: Earth, Time, Light, Sun, Atmosphere
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