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Topic: Altitude (astronomy)

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	Altitude - Wikipedia, the free encyclopedia
		Altitude is the elevation of an object from a known level or datum, called zero level.
		In aviation, the term altitude is used to describe elevation above mean sea level, the term height refers to elevation above a ground reference point and the term flight level is the elevation according to a standard pressure altimeter setting.
		In North America and the UK altitude is usually measured in feet.
	en.wikipedia.org /wiki/Altitude (275 words)

	AllRefer.com - altitude (Geology And Oceanography) - Encyclopedia
		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 Polaris, is equal to the observer's latitude.
	reference.allrefer.com /encyclopedia/A/altit.html (313 words)

	* Altitude - (Astronomy): Definition
		Altitude is a measurement in mapping astronomical objects on the celestial sphere (the sky as visible from Earth).
		Altitude is the angle of the object from the observer's horizon.
		Altitude is the distance between the horizon and the zenith.
	en.mimi.hu /astronomy/altitude.html (1576 words)

	Astronomy Answers: From the Astronomical Dictionary (Site not responding. Last check: 2007-10-09)
		In daily life, they are used to indicate how far above sea level something is. In astronomy, they are used for that as well, but also to indicate how far (in degrees) something like a planet or a star is above the horizon.
		In the horizontal coordinate system, altitude is the coordinate that measures the height above the horizon (in degrees).
		If you read about astronomical altitudes, then you may assume they are measured relative to the artificial horizon, unless the accompanying text says otherwise.
	www.astro.uu.nl /~strous/cgi-bin/glossary.cgi?l=en&o=altitude (186 words)

	Infrared astronomy - Wikipedia, the free encyclopedia
		Infrared astronomy is the branch of astronomy and astrophysics which deals with objects visible in infrared (IR) radiation.
		Scientists classify infrared astronomy as part of optical astronomy because optical components (mirrors, lenses and solid state digital detectors) are usually used.
		After the use of prisms by Isaac Newton to split white light into a spectrum, it was found in 1800 by William Herschel that the hottest part of the band of light from the Sun was actually past the red end of the spectrum.
	en.wikipedia.org /wiki/Infrared_astronomy (721 words)

	MSN Encarta - Astronomy
		The altitude of an object is equal to its angle, in degrees, above the horizon.
		The azimuth of an object is equal to its angle in the horizontal direction, with north at 0°, east at 90°, south at 180°, and west at 270°.
		For example, if an astronomer were looking for an object at 23° altitude and 87° azimuth, the astronomer would know to look fairly low in the sky and almost directly east.
	ca.encarta.msn.com /encyclopedia_1741502444_5/Astronomy.html (1281 words)

	Curious About Astronomy: What are Altitude and Azimuth?
		Altitude ranges from 0 to 90 degrees, and measures the angle between the horizon, you, and the object.
		An object with 0 degrees altitude is right on the horizon, while an object at 90 degrees altitude is directly overhead.
		Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.
	curious.astro.cornell.edu /question.php?number=113 (356 words)

	MSN Encarta - Search Results - Altitude (astronomy) (Site not responding. Last check: 2007-10-09)
		Infrared Astronomy, the detection and study of infrared radiation emanating from celestial objects.
		Altitude (astronomy), the angular distance of a heavenly body above the horizon.
		Usually the altitude of a fixed point, such as a mountain peak, is determined most accurately...
	uk.encarta.msn.com /Altitude_(astronomy).html (88 words)

	Space and Astronomy [encyclopedia] (Site not responding. Last check: 2007-10-09)
		In astronomy and common usage, space is the part of the universe lying outside of the limits of the Earth's atmosphere; the apparently empty parts of the Universe, between planets and stars; the expanse in which the Solar System, stars, and galaxies exist.
		Astronomy is the science dealing with all the celestial objects in the universe, including the planets and their satellites (e.g.
		In astronomy, the universe is everything there is that can be detected by physical effects; the aggregate of all matter, energy and space.
	kosmoi.com /Space (1312 words)

	08 Using a Simple Astrolabe - At Home Astronomy (Site not responding. Last check: 2007-10-09)
		An astrolabe can be used to measure the altitude of an object, including changes in the Sun's path over the course of the year.
		In the spring, the altitude of the Sun increases.
		The cause of the change in altitude (i.e., the location of the Sun) is the tilt of the Earth's axis, which causes the Earth to face the Sun at an angle of 23 degrees.
	cse.ssl.berkeley.edu /AtHomeAstronomy/activity_08.html (531 words)

	Zoom Astronomy Glossary: A
		An almucantar (also called a "parallel of altitude") is a circle on the celestial sphere that is parallel to the horizon.
		Altair (alpha Aqu) is a fist-magnitude star in the (in the constellation Aquila (the eagle); Altair is the 12th brightest star in the sky.
		Astronomy is the scientific study of space, including the planets, stars, galaxies, comets, and nebulae.
	www.enchantedlearning.com /subjects/astronomy/glossary (4918 words)

	Altitude (astronomy) - Wikipedia, the free encyclopedia
		In astronomy and surveying, altitude (sometimes called elevation) is one of the two coordinates of the horizontal coordinate system, and refers to the vertical angle from the horizon.
		The other coordinate is azimuth, which refers to the horizontal angle from the north.
		The altitude, α, of a star is given by:
	en.wikipedia.org /wiki/Altitude_%28astronomy%29 (98 words)

	Definition of Altitude - Biocrawler (Site not responding. Last check: 2007-10-09)
		In astronomy and surveying, altitude is one of the two coordinates of the horizontal coordinate system, and refers to the vertical angle from the horizon.
		In geometry, an altitude of a triangle is a line passing through one vertex and being perpendicular to the opposite side.
		In music, the altitude of a note is its height or depth relative to Middle C. For example, Soprano C has a much higher altitude than Tenor C.
	www.biocrawler.com /biowiki/Altitude (460 words)

	Department of Astronomy: Altitude Sickness (Site not responding. Last check: 2007-10-09)
		Every year teams of astronomy students and teachers visit Gemini, a telescope the University of Florida commonly uses for observations.
		Gemini is located on the mountain of Mauna Kea in Hawaii at an altitude of 13,796 feet.
		Altitude sickness is only rarely experienced at Hale Pohaku and most commonly experienced at Mauna Kea.
	www.astro.ufl.edu /altsick.html (508 words)

	Azimuth, Altitude, Right Ascension, and Declination Using CyberSky
		The altitude is measured from 0° at the horizon to 90° at the point straight overhead, referred to as the zenith.
		It is not necessary to exceed 90° since a point more than 90° would be behind the observer, and the observer would only need to change their facing (and hence their azimuthal angle) and measure from the new horizon to the point of interest.
		The altitude represents the angular measure of the pointer above the horizon.
	wind.cc.whecn.edu /~marquard/astronomy/coordinates.htm (1488 words)

	sphaeric : naked eye astronomy and navigation (Site not responding. Last check: 2007-10-09)
		If the altitude you calculated for your assumed position is less steep than your real sextant measurement you know that you are not at your assumed position, you are closer to the overhead point and if it is less steep you are further away.
		Finding the azimuth and altitude at the assumed position for 22:00 hours GMT can be done using the same diagram, we assume the suns declination to be the same (although it will have changed very slightly) and the distances between o, p, z and m will all be same.
		For the afternoon sight the sextant altitude and assumed position calculated altitude were the same, so we draw the position line through the assumed positon perpendicular to the azimuth.
	www.headmap.org /unlearn/sphaeric/sextant.htm (3574 words)

	The Altitude of the Sun with Changing Latitude
		In another exercise, it was discovered that the time the sun crossed the meridian was dependent upon the longitude of the observer.
		The next two under "Horizontal Coordinates" are compass azimuth (South should be nearly 180 degrees) and angular altitude (the one we are interested in here).
		Note that if the sun is on the meridian, the azimuth should be nearly 180 degrees when the cursor is over the sun.
	wind.cc.whecn.edu /~marquard/astronomy/altitude.htm (738 words)

	Astronomy Without a Telescope
		This was due in part to the influence of astrology, but later, accurate positions came to be important for determining the physical characteristics of the stars and planets.
		The altitude of a star is how many degrees above the horizon it is (anywhere from 0 to 90 degrees).
		What is the altitude of the NCP at Fairbanks, Alaska (lat.
	www.astronomynotes.com /nakedeye/s6.htm (1563 words)

	Activities!
		Illustrate altitude and its complement co-altitude (or zenith distance) of a sighted star or the sun in celestial navigation.
		Altitude of the Noon Sun II Demonstrate the relationships between the date, the altitude of the Sun at transit, the observer’s latitude, and the altitude of Polaris.
		Demonstrate the relationships between the date, the altitude of the primary navigation stars at transit, the observer’s latitude, and the altitude of Polaris.
	analyzer.depaul.edu /paperplate/activities.htm (2135 words)

	KryssTal : Coordinate Systems
		Altitude is measured from the horizon to the object.
		For London, the Sun's altitude at Noon on December 21st is only 15°; on June 21st the altitude at Noon is 62°.
		In Singapore, the Sun's Noon altitude varies between 65.5° and 112.5°; at some stage in the year the sun must be at an altitude of 90° - in other words, overhead.
	www.krysstal.com /coordsystems.html (2563 words)

	Earth's Atmosphere - Zoom Astronomy
		At an altitude of 10,000 feet, the air pressure is 10 pound per square inch (and there is less oxygen to breathe).
		•Stratosphere: The stratosphere is characterized by a slight temperature increase with altitude and the absence of clouds.
		The Earth's atmosphere was formed by planetary degassing, a process in which gases like carbon dioxide, water vapor, sulphur dioxide and nitrogen were released from the interior of the Earth from volcanoes and other processes.
	www.enchantedlearning.com /subjects/astronomy/planets/earth/Atmosphere.shtml (586 words)

	Curious About Astronomy: How do sunrise and sunset times change with altitude?
		At most latitudes on the Earth, the effect of increased altitude is the same: it makes the Sun rise earlier and set later than it would at that same location from the ground.
		Since the Earth moves around the Sun at a rate of a quarter of a degree a minute, it means that at this altitude, sunset occurs 8 minutes later than it would from the ground.
		The variation with altitude is approximately linear, and so we conclude that sunset is later by 1 minute for every 1.5 kilometres in altitude, and that sunrise is earlier by the same amount.
	curious.astro.cornell.edu /question.php?number=388 (353 words)

	Positional Astronomy
		The Altitude of an object is measured with respect to the Celestial Horizon; i.e.
		The altitude of the NCP is equal to the latitude of the observer.
		Users of altazimuthally mounted instruments often find it useful to be able to convert equatorial co-ordinates to horizon (altitude and azimuth) ones.
	www.astunit.com /tutorials/positional.htm (503 words)

	Astronomy On-Line: Final Event (Site not responding. Last check: 2007-10-09)
		By determining the altitude of the Polar Star over the northern horizon, you will be able to determine at the same time your geographical latitude.
		In that case, we propose that you observe the altitude of the Sun at local noon.
		For instance, if you measure a solar altitude of 60 degrees on November 19, then your geographical latitude is 10.5 degrees North (90 + (-19.5) - 60 = +10.5).
	www.vt-2004.org /outreach/spec-prog/aol/market/information/finevent (664 words)

	Lesson 3 - The Earth's Motion
		Principles of Astronomy is copyright protected, is the sole property of the author (Dr Jamie Love © 1997 - 2005) and is sold exclusively by Merlin's Science Academy.
		When thinking about astronomy, one thing to keep clear in your mind is whether you are thinking about the sky's image or the image of the sky that you have from your current location.
		A star with an altitude of more than 90 degrees is actually past your zenith on the other side of the sky and its real altitude should be measured from that (opposite) horizon.
	www.synapses.co.uk /astro/earthmot.html (4539 words)

	Mauna Kea Hazards
		The intensity of these symptoms may be lessened by spending at least a half hour at the Visitor Information Station (altitude 9,200 feet or 3,000 m) before traveling to the summit.
		High altitude exposure is particularly hazardous for people in poor physical condition, for those with heart or respiratory problems, for pregnant women and their unborn children, and for children and teenagers under 16.
		High altitudes can also cause the life-threatening conditions pulmonary edema (fluid in the lungs) and cerebral edema (fluid on the brain).
	www.ifa.hawaii.edu /publications/infobul/Mauna_Kea_Hazards.html (648 words)

	Astronomy Tales
		The stalk is not adjustable, and in this scope the mirror was not centered in the focuser.
		The telescope mount itself is also somewhat lame, in that the nylon altitude bearings and teflon/laminate azimuth bearings make for pretty stiff action, requiring jerks and tugs to e.g.
		To improve the altitude action we got a sheet of teflon (from a junk store) and cut some perhaps 3 inch strips for the altitude bearings.
	www.ffd2.com /astro/scope.html (1215 words)

	Denis McGuire's Astronomy Page
		They will be visible from their rising in the east at 01.30 hrs, to the south-east at an altitude of 34° at Sun rise.
		At Sun set, Venus is in the west-north-west at an altitude of 11 deg and visible for an hour and a half after Sunset, setting in the north-west.
		Despite the great technological and theoretical leaps made in science and astronomy, it is a very bad reflection of the ties that so many people put so much faith in astrology.
	members.aol.com /DEPMcGuire/astrony.htm (1744 words)

	Physics and Astronomy Forums - Noise and Altitude (Site not responding. Last check: 2007-10-09)
		For starters, here is an interactive device you might use to see how the altitude affects the speed of sound.
		I guess I thought that there would be more study and clear distinctions of how, potentially, many things are different at altitude.
		The physics is a first step; what I am really curious about is if there are or should be differences in laws, public policy, and behavior as a result of altitude.
	www.physlink.com /Community/Forums/printthread.cfm?Forum=17&Topic=2134 (484 words)

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