Elevation
The angle above the of a celestial object also called the and equal to 90° minus the .
elevation: see altitude.
ellipse: a conic section and the path the Earth follows during a year (neglecting only the small perturbations caused by the moon and the other planets). It is defined by two foci, and by a major and a minor axis.
Elevation extremes: (measured relative to sea level)
Lowest point on land: Dead Sea -408 m
Lowest point overall: Marianas Trench in the Pacific Ocean -10,924 m
Highest point: Mount Everest 8,850 m (1999 est.) ...
Elevation
The angle in degrees above the horizon toward the zenith or overhead point. Sometimes loosely called the "altitude" of a star, but not to be confused with height above sea level.
Elevation of Sun. The angle between the position of the Sun's center in the sky and the point nearest to it on the horizon.
Elevation diagram of 4 Vesta viewed from the south-east, showing the south pole crater. As determined from Hubble Space Telescope images of May 1996.
Elevation
The elevation of a geographic location is its height above a fixed reference point, often the above mean sea level.
Elevation above ground or distance upwards from a given level (especially sea level) to a fixed point. (See altitude.) [S92]
Heisenberg Model ...
Elevation
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The elevation of the land surface of the Earth varies from the low point of âˆ'418 m at the Dead Sea, to a 2005-estimated maximum altitude of 8,848 m at the top of Mount Everest. The mean height of land above sea level is 686 m.
Hydrosphere ...
Each elevation point is known with an accuracy of 13 meters (42 feet) on average, with large areas of the flat northern hemisphere known to better than two meters (a little over 6 feet).
EL -- Elevation.
Ellipse -- A closed plane curve generated in such a way that the sums of its distances from the two fixed points (the foci) is constant.
ELV -- Expendable launch vehicle.
datum (elevation) (Glossary of Hydrologic Terms - NOAA) The arbitrary "zero plane" from which all stage measurements are taken from. Usually set below the natural bottom of the channel so all stage height readings will be greater than zero.
The difference in elevation between the hemispheres results in a slope from the South Pole to North Pole that was the major influence on the global-scale flow of water early in martian history.
C-display In radar, a rectangular display in which targets appear as blips with bearing indicated by the horizontal coordinate and angles of elevation by the vertical coordinate. Also called C-scan and C-scope. celestial 1.
'Liquid water is typically stable at the lowest elevations and at low latitudes on the planet because the atmospheric pressure is greater than the vapor pressure of water and surface temperatures in equatorial regions can reach 273 K for parts of ...
Hellas impact basin on Mars, shown in a topographic map (bottom) and an averaged elevation profile …[Credit: NASA/JPL/Goddard Space Flight Center]
Yuty Crater on Mars, in a photograph by the Viking 1 orbiter.
Unfavourable conditions are moonlight, nearness to the Milky Way, and elevation of the light above the horizon (and therefore a depression of the sun below the horizon) of less than 20°, and the presence in the region of any bright planet.
The entire surface of the planet is dry and rocky; because there is no "sea level," elevations are given as planetary radius--i.e., as the distance from the centre of the planet to the surface.
Elevation (or altitude), the angle between the observer's horizon and the star (angle E in figure 4). Straight up is 90 degrees, the horizon is 0 degrees. For the North Star, the elevation equals the geographic latitude.
The low elevation maria (seas) have fewer craters than other areas. This is because these areas formed more recently, and have had less time to be hit. The biggest intact lunar crater is Clavius which is 100 miles (160 km) in diameter.
This mission has produced a great deal of information, not only through the images, but also with other detectors such as elevation and magnetic field detectors.
2001 Mars Odyssey, has been orbiting Mars since October 2001.
Ice Cloud and Land Elevation Satellite (ICEsat) →
ICEsat (Ice Cloud and Land Elevation Satellite) →
IMAGE Mission (Imager for Magnetopause-to-Aurora Global Exploration) → ...
If you have ever cooked food at high elevations using boiling water, you know that it takes longer because water boils at a lower temperature than at sea level. That is because the air pressure at high elevations is less.
This depends on the amount of heating that the earth receives in a single day throughout the year, and this depends on how many hours the sun is above the horizon and exactly how long it spends at its highest elevation above the horizon.
The best time for observing is after midnight when the radiant reaches a reasonable elevation. pi-Puppids, peak April 23 The pi-Puppids are produced by Comet 26P/Grigg-Skjellerup. The hourly rate is variable, up to 40 an hour have been recorded.
The second illustration is not an image; it is an altimetry map"that is, an elevation map of the mountains and valleys"for nearly the same south polar region.
For those in the northern hemisphere it is a navigator's benchmark, the elevation above the horizon closely equal to the observer's latitude. Actually, Polaris is slightly off the pole and has a tiny circle around it about 1.5 degrees across.
Panel c is a radar-generated map of the surface elevation of the polar region. The white line from A to A' is the ground track for the radargram in panel a. Yellow dashed lines show the extent of the basal unit and of the layered deposits.
In the later stages of evolution, further contraction and elevation of temperature open up new thermonuclear reactions.
Olympic Mons, a structure showing all the characteristics of a basaltic volcano, reaches an elevation of more than 25 km (15.5 mi) and measures more than 600 km (370 mi) across its base.
The camera is fully controllable in both elevation and side-to-side (azimuth) motion by stepper motors with gear heads which provide a field 178° in azimuth and +83° to -72° in elevation. The optics do not require active focusing.
There are two "continents", which are large regions several kilometers above the average elevation. These are called Istar Terra and Aphrodite Terra.
However, at an elevation of 2 km, k is about 48.8", a 19% reduction in refraction from sea level. For 400 (blue), 500, 600 and 700 (red) nm wavelengths, the corresponding STP k values are 60.4", 57.8", 57.4", and 57.2", respectively.
In contrast, most of the northern hemisphere consists of plains which are much younger, lower in elevation and have a much more complex history. An abrupt elevation change of several kilometers seems to occur at the boundary.
An alt/az mount must have a fiduciary mark such that the tube can be placed accurately at 90 degrees to the elevation axis. One way to do this is to (one time only) level the ground board, then the tube.
In ancient times Cancer was where the Sun appeared at its maximum mid-day elevation at the time of the (northern) summer solstice. Because of the precession of the equinoxes the northern summer solstice now occurs when the Sun is in Taurus.
Candidate landing sites had to be near the equator, low in elevation, not too steep, not too rocky and not too dusty.
An Arabic and medieval European sighting instrument on an altazimuth mounting, used to determine the elevation above the horizon of celestial objects.
Mountain: A natural elevation of a planetary surface.
Nakhlites: One of the three types of meteorites from Mars (the SNC meteorites).
The elevation of Alpha Regio varies over a range of 4 km (2.5 mi). Low-lying areas appear dark in the radar images and may be filled with lava. Volcanoes appear as bright spots on the smooth plains. Notice the large volcano in the upper right.
Some mountain peaks reach elevations of 4 or 5 kilometers above the lunar surface! They are particularly striking when the terminator is nearby.
" He had found fossil shells at an elevation of 12,000 feet, and he theorized that a chain of suboceanic volcanoes had poured forth enormous quantities of lava that formed the Andes through a further process of upheaval and fracturing.
He also measures accurately the angle to which he has to tilt his telescope to see the star, that is, the elevation or altitude of the star as it crosses his meridian.
PLAINS
Vast, flat areas with low elevation.
PROBES
Unmanned spacecraft which are launched into space in order to collect data about the solar system and beyond. Space probes are not necessarily designed to return to Earth.
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.
The southern hemisphere is predominantly ancient cratered highlands. The majority of the northern hemisphere has plains which are much younger and lower in elevation. An abrupt elevation change of several kilometers seems to occur at the boundary.
At present, around a third of ALMA's eventual 66 radio antennas make up the growing array on the Chajnantor plateau in northern Chile, at an elevation of 5,000 meters.
Definition: mensa: A mesa. Flat-topped elevation.
Space Tragedies9 Planets in Nine DaysAstronomy 101
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These craters range in size up to many hundreds of kilometers, but the most enormous craters have been flooded by lava, and only parts of the outline are visible. The low elevation maria (seas) have fewer craters than other areas.
This means that when working with ground based telescopes they should be viewed when they are as high in the sky as possible and from as high elevations are as possible.
Equipotential - A line or surface of equal potential energy. On the Earth, a line of equal elevation is approximately an equipotential ...
The largest group of infrared telescopes can be found on top of Mauna Kea (a dormant volcano) on the island of Hawaii. At an elevation of 13,796 ft.
Because it is hot enough to melt lead at the surface, metals vaporize and condense at cooler, higher elevations.
Venus in Human Culture ...
Sirius on New Year's night, on the other hand, playacts as the Sun of Groundhog Day. It rises and sets on the same place on the horizon. At midnight, it rises to the same elevation as the February 2 noonday Sun.
The principal feature of WinOrbit is a series of Map Windows, which display the current position of satellites and observers on a simple world map, together with information such as bearing (azimuth), distance, and elevation above the observer's ...
A major difference between geocentric and topocentric ephemerides is that no local horizon exists (and therefore derived quantities such as azimuth and elevation are not defined) for a geocentric ephemeris.
Thermal gradients at different elevations in the atmosphere are usually responsible for the quality of the seeing. Seeing also usually deteriorates for objects closer to the horizon because the light has to pass through a greater air mass.
Refraction within the thermal cells also causes the color of the object to rapidly change. The altitude or elevation about the horizon also effects astronomical seeing due to the increase in airmass.
The reason for the difference between it and the DALR is that latent heat is released when water cools and condenses. The actual lapse rate varies with elevation.
 See also: Time, Earth, Second, Period, Light
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