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Topic: Equatorial coordinate system


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  Equatorial coordinate system - Wikipedia, the free encyclopedia
It is the most closely related to the geographic coordinate system, because they use the same fundamental plane, and the same poles.
The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short).
Unlike longitude, right ascension is usually measured in hours instead of degrees, because the apparent rotation of the equatorial coordinate system is closely related to sidereal time and hour angle.
en.wikipedia.org /wiki/Equatorial_coordinate_system   (391 words)

  
 Astronomy/Coordinate Systems - Wikibooks, collection of open-content textbooks
The coordinate system consists of one or more reference points, the styles of measurement (linear measurement or angular measurement) from those reference points, and the directions (or axes) in which those measurements will be taken.
The second coordinate is galactic longitude, which is the angular separation of the object from the galaxy's "prime meridian," the great circle that passes through the Galactic center and the galactic poles.
The galactic coordinate system is usefule for describing an object's poisition with respect to the galaxy's center.
en.wikibooks.org /wiki/Astronomy/Coordinate_Systems   (821 words)

  
 Coordinate system -   (Site not responding. Last check: 2007-11-07)
The system of assigning longitude and latitude to geographical locations is a coordinate system.
Curvilinear coordinates are a generalization of coordinate systems generally; the system is based on the intersection of curves.
Circular coordinate system (commonly referred to as the polar coordinate system) represents a point in space by an angle and a distance from the origin.
psychcentral.com /psypsych/Coordinate_system   (1229 words)

  
 Equitorial Coordinates
The coordinates of the system form a sidereal (star) clock composed of 24 hours which is equal to the interval of one earth rotation.
Using the equatorial coordinate system, we can specify the position of the individual stars on the surface of the celestial sphere just as the earth's system of latitude and longitude enables us to specify an individual's position on the surface of the earth.
In the horizon system of coordinates known as altitude and azimuth, we specify the position of a star relative to the earth's surface by stating the star's place relative to our local horizon in terms of its altitude (elevation) and azimuth (direction).
www.astronomy.org /astronomy-survival/coord.html   (1514 words)

  
 Astronomy - MSN Encarta
Astronomers use coordinate systems to label the positions of objects in the sky, just as geographers use longitude and latitude to label the positions of objects on Earth.
The equatorial coordinate system is a coordinate system fixed on the sky.
In the equatorial coordinate system, the celestial sphere turns with the stars (but this movement is really caused by the rotation of Earth).
encarta.msn.com /encyclopedia_1741502444_5/Astronomy.html   (1298 words)

  
 Basic Astronomical Terms
Celestial coordinate corresponding to latitude in the equatorial celestial coordinate system.
Celestial coordinate corresponding to longitude in the equatorial celestial coordinate system.
The celestial coordinate corresponding to latitude is the Declination.
www.seds.org /messier/xtra/Terms/terms.html   (939 words)

  
 Cool Cosmos
These three systems are the equatorial, ecliptic and galactic coordinate systems which use the Earth, the ecliptic plane (the path the Earth takes around the Sun), and the center of our galaxy, respectively, as their central locations.
In the equatorial system, the Earth's equator and poles are projected outward into space to form a celestial sphere with the Earth at the center.
In the ecliptic system, latitude is measured with respect to the ecliptic plane and position is measured by ecliptic latitude (elat) and ecliptic longitude (elon).
coolcosmos.ipac.caltech.edu /cosmic_classroom/cosmic_reference/coordsys.html   (511 words)

  
 Celestial coordinate system -   (Site not responding. Last check: 2007-11-07)
In astronomy, a celestial coordinate system is a coordinate system for mapping positions in the sky.
There are different celestial coordinate systems each using a coordinate grid projected on the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth.
The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle.
psychcentral.com /psypsych/Celestial_coordinate   (401 words)

  
 "Amateur Astronomy". Celestial Mechanics Definitions List
The main axis (or polar axis) of the equatorial system is the celestial sphere' axis.
The equatorial coordinate system is affixed to the celestial sphere.
Equatorial coordinate system used by professionals is technically a dynamical system based on the definition of its equator and its point of origin by reference to Earth's motion, complemented with a set of 1,535 bright stars (this set is said "Fifth Fundamental Catalogue (FK5)").
stars5.netfirms.com /definitions.htm   (2244 words)

  
 Ecliptic coordinate system - Wikipedia, the free encyclopedia
The ecliptic coordinate system is a celestial coordinate system that uses the ecliptic for its fundamental plane.
The ecliptic is the path that the sun appears to follow across the sky over the course of a year.
Like right ascension in the equatorial coordinate system, the zeropoint of the ecliptic longitude is the vernal equinox.
en.wikipedia.org /wiki/Ecliptic_coordinate_system   (300 words)

  
 Astronomy Hypertext: Astronomical Coordinate Systems
Coordinates in the horizon system are known as azimuth and altitude.
The major disadvantage of the horizon system is that it is peculiar to the observer and not at all a general system.
In the horizon system, the horizon and vertical circles remain fixed relative to an observer with the celestial sphere moving relative to them, whereas in this system, the celestial meridian and hour circles are on the celestial sphere and thus rotate with it relative to an observer.
physics.gmu.edu /~jevans/astr103/CourseNotes/earthSky_coordinateSystems.html   (1047 words)

  
 Coordinate system   (Site not responding. Last check: 2007-11-07)
In mathematics as applied to geometry physics or engineering a coordinate system is a system for assigning a tuple of scalars to each point in an n- dimensional space.
The system of assigning longitude and latitude to geographical locations is a coordinate In this case the parametrization fails to be unique at the and south poles.
Cylindrical coordinate system represents a point in space by angle a distance from the origin and height.
www.freeglossary.com /Coordinate   (669 words)

  
 Coordinate Systems
While the center of the grid for the horizontal system appears to be in the center of the sky, the center for the equatorial system is somewhere up towards the north, definitely off-center.
The equatorial coordinate system is a fixed coordinate system, meaning the coordinates that describe the location of a star don't change with location on the Earth or with time.
Equatorial coordinates make it much easier for astronomers to tell what star a person is referring to, since all stars have fixed coordinates.
members.tripod.com /kjk176/coord_info.htm   (888 words)

  
 SkyView User's Guide   (Site not responding. Last check: 2007-11-07)
Equatorial: The Equatorial coordinate system is a projection of the Earth's latitude and longitude onto the heavens.
The Ecliptic and Equatorial coordinate systems are subject to a slow rotation as the position of the vernal equinox, which defines the prime meridian in these systems, changes.
Near the poles users should be aware that the longitude-like coordinate may be suspect due to the singularity in the coordinate systems.
skyview.gsfc.nasa.gov /help/skyuser.html   (6357 words)

  
 Observation - Coordinates and Direction
This system is difficult to use in Astronomy for two reasons: the celestial sphere does not rotate this way, and the coordinates of stars, planets, and galaxies are given based on the equatorial system.
The axis of rotation for the equatorial system is the North and South Poles.
This coordinate system is useful when plotting the positions of the other planets as well as asteroids and comets.
astronomyonline.org /Observation/Coordinates.asp?Cate=Observation&...   (440 words)

  
 equatorial coordinate system on Encyclopedia.com   (Site not responding. Last check: 2007-11-07)
EQUATORIAL COORDINATE SYSTEM [equatorial coordinate system] the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celestial sphere.
The celestial sphere is an imaginary sphere with the observer at its center.
Because the vernal equinox is not always visible in the night sky (especially in the spring), whereas the sigma point is always visible, the hour angle is used in actually locating a body in the sky.
www.encyclopedia.com /html/e1/equatrC1S1.asp   (699 words)

  
 Facts about equatorial coordinate system   (Site not responding. Last check: 2007-11-07)
The equatorial coordinate system is probably the most widely used celestial coordinate system.
It is also the most closely related to the geographic coordinate system, because they use the same fundamental plane, and the same poles.
However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does.
www.supercrawler.com /Facts/equatorial_coordinate_system.html   (327 words)

  
 Astrometry of Asteroids: Introduction   (Site not responding. Last check: 2007-11-07)
If you’ve ever used a roadmap or a map of the world, where two coordinates are used to mark the positions of cities and mountains, you know the usefulness of coordinate systems.
Coordinates on a piece of graph paper are measured with respect to the corner or to the origin of the graphs.
The computer performs what is called a coordinate transformation from the images on the screen to the equatorial coordinates, and prints out a solution showing you the coordinates of your unknown object.
www.astro.lsa.umich.edu /Course/Labs/asteroids/intro.htm   (2115 words)

  
 Equatorial Coordinates
The horizon coordinate system (altitude and azimuth) is not convenient for specifying the location of celestial objects because the horizon coordinates of stars and other objects are continuously changing with time (due to the rotation of the Earth).
An object's equatorial coordinates remain the same regardless of from where on Earth the object is viewed.
The equatorial coordinate system used to specify the positions of celestial objects is directly analogous to the latitude-longitude coordinate system used on Earth.
www.bisque.com /help/Patterns/patterns/equatorial_coordinates.htm   (381 words)

  
 How to Use SkyView   (Site not responding. Last check: 2007-11-07)
The fundamental coordinate system for observations made from the surface of the Earth is the equatorial system.
The equatorial system works in much the same way as latitude and longitude are used to determine position on the Earth.
As described in the equatorial coordinate system, the Earth goes through several motions and perturbations over the course of years and centuries which affect the position of objects in the sky.
skyview.gsfc.nasa.gov /help/howto.html   (2135 words)

  
 Earth Coordinate System
The horizontal coordinate system (commonly referred to as the alt-az system) is the simplest coordinate system as it is based on the observer's horizon.
A more convenient coordinate system for cataloging purposes is one based on the celestial equator and the celestial poles and defined in a similar manner to latitude and longitude on the surface of the Earth.
In this system, known as the equatorial coordinate system, the analog of latitude is the declination,
zebu.uoregon.edu /~js/ast121/lectures/lec03.html   (2904 words)

  
 Search Results for "Coordinate System"   (Site not responding. Last check: 2007-11-07)
...Cartesian coordinates, and in which the approach to geometric problems is primarily algebraic.
...declination, in astronomy, one of the coordinates in the equatorial coordinate system.
The declination of a celestial body is its angular distance north or south...
bartleby.com /cgi-bin/texis/webinator/65search?query=Coordinate+System   (263 words)

  
 CLEA AstrometryLab
Two coordinates are all that is needed since the surface of the earth, the city map, and the sky, all appear two dimensional to the observer.
The coordinates that are commonly used to specify star positions in astronomy indicate the star’s position with respect to the celestial equator, an imaginary line in the sky that runs above the earth’s equator, and are therefore called the equatorial coordinate system.
For example, its equatorial coordi-nates measured in June, when the earth is at one side of the sun, will be different from its position in January when the earth is at the other side of the sun (see Figure 5).
www.mines.edu /Academic/courses/physics/phgn324/CLEA/Astrlab.html   (7262 words)

  
 Adler Planetarium / CyberSpace / History of Astronomy / Tools / Coordinate Systems   (Site not responding. Last check: 2007-11-07)
Coordinate systems are one of the more important tools of astronomy.
A coordinate system on the celestial sphere would be independent of the motion and location of the observer.
This coordinate system allows astronomers to have a general system because it is independent of location on Earth and celestial motion.
www.adlerplanetarium.org /cyberspace/history/tools/coordinate.html   (324 words)

  
 Coordinate Systems in Astronomy
The reference points for the relative coordinate system are the meridian and the horizon.
The second relative coordinate - altitude or ALT - measures the angle between the star and the nearest point on the horizon.
Solar system objects, which lie near the ecliptic, have altitudes on the meridian which vary with the time of year.
www.astro.virginia.edu /~teacha/130_manual/node9.html   (1059 words)

  
 Spherical Coordinate System Lab
This coordinate system is based upon the physical fact that we live on the earth and gravity pulls us to the earth establishing and up and a down locally.
This coordinate system is based upon the physical fact that the earth revolves about the sun in a year.
This coordinate system is based upon the physical fact that we live in a flattened disk of stars that the solar system revolves about in approximately 250 million years.
www.mc.cc.md.us /Departments/planet/planet/Coordinate_Systems_Lab.htm   (1626 words)

  
 Astronomy Without a Telescope
A concise summary of this coordinate system and the numbers involved is given at the end of this section.
This system is very similar to the longitude-latitude system used to specify positions on the Earth's surface.
This system is fixed with respect to the stars so, unlike the altitude-azimuth system, a star's position does not depend on the observer's location or time.
www.astronomynotes.com /nakedeye/s6.htm   (1563 words)

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