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Topic: Supergalactic coordinate system

	Coordinate system - Biocrawler (Site not responding. Last check: 2007-11-03)
		Some choices of coordinate systems may lead to paradoxes, for example, close to a fl hole, but can be understood by changing the choice of coordinate system.
		Curvilinear coordinates are a generalization of coordinate systems generally; the system is based on the intersection of curves.
		Cylindrical coordinate system represents a point in space by an angle, a distance from the origin and a height.
	www.biocrawler.com /encyclopedia/Coordinates (762 words)

	Coordinate system Summary
		The three-dimensional coordinate system is an extension of the twodimensional coordinate system invented in 1637 by French mathematician René Descartes (1596–1650).
		However, in a two-dimensional coordinate system, it is impossible to describe the location of an object that is off the plane of the floor, such as the location of a crystal on a chandelier that is hanging from the ceiling.
		In a three-dimensional coordinate system, it is possible to refer to the location of a chandelier crystal with reference to the two walls of the room and also the floor.
	www.bookrags.com /Coordinate_system (2007 words)

	Coordinate system - Wikipedia, the free encyclopedia
		In mathematics and applications, a coordinate system is a system for assigning a tuple of numbers to each point in an n-dimensional space.
		Circular coordinate system (commonly referred to as the polar coordinate system) represents a point in the plane by an angle and a distance from the origin.
		Plücker coordinates are a way of representing lines in 3D Euclidean space using a six-tuple of numbers as homogeneous coordinates.
	en.wikipedia.org /wiki/Coordinate_system (743 words)

	10.4 PRECESS - Astronomical Coordinate Conversion (Site not responding. Last check: 2007-11-03)
		While the coordinate system in most widespread use among astronomers is the B1950.0 system of equatorial coordinates, the IAU have recommended that J2000.0 coordinates be used.
		The system is defined in terms of B1950 equatorial coordinates as RA of (l=0) = 192.25 degrees, inclination of galactic equator to B1950 equator = 62.6 degrees, longitude of ascending node 33 degrees.
		The supergalactic equator is conceptually defined by the plane of the local (Virgo-Hydra-Centaurus) supercluster, and the origin of supergalactic longitude is at the intersection of the supergalactic and galactic planes.
	ledas-cxc.star.le.ac.uk /udocs/docs/PG/html/node76.html (1449 words)

	Reference.com/Encyclopedia/Celestial coordinate system
		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.
	www.reference.com /browse/wiki/Celestial_coordinate_system (363 words)

	ccfind (Site not responding. Last check: 2007-11-03)
		xrotation and yrotation are interpreted as the rotation of the ra / longitude and dec / latitude coordinates with respect to the x and y axes, and default 0.0 and 0.0 degrees respectively.
		CCFIND computes the pixel coordinates of each object by, 1) transforming the input celestial coordinates to image celestial coordinate system, 2) using the image celestial coordinate system to compute the initial pixel coordinates, and 3) computing the final pixel coordinates using a centroiding algorithm.
		The equatorial coordinate systems must be one of: 1) FK4, the mean place pre-IAU 1976 system, 2) FK4-NO-E, the same as FK4 but without the E-terms, 3) FK5, the mean place post-IAU 1976 system, 4) ICRS the International Celestial Reference System, 5) GAPPT, the geocentric apparent place in the post-IAU 1976 system.
	stsdas.stsci.edu /cgi-bin/gethelp.cgi?ccfind (2531 words)

	Conversion to Standard Celestial Coordinates
		In the original AIPS convention, the native system was required to be locally parallel to the standard celestial coordinate system at the tangent point.
		The axes of the native sky coordinate system derived by deprojection need not be in the same direction as those of the standard celestial coordinate system.
		(floating) for longitude of the pole, is the longitude of the North Pole of the standard coordinate system in the native coordinates.
	heasarc.gsfc.nasa.gov /docs/heasarc/fits/users_guide/node60.html (338 words)

	PHY 445/515: Coordinate Systems (Site not responding. Last check: 2007-11-03)
		The ecliptic coordinate system is based on the apparent Solar orbit, and is the natural system for Solar System studies.
		The galactic equator is inclined to the celestial equator by 62.6
		Coordinates are measured with respect to the local zenith and the local horizon.
	capa1.physics.sunysb.edu /~senior/astronomy/coords.html (428 words)

	System - Coordinate system used to describe positions within the domain
		The System attribute identifies the particular coordinate system represented by a Frame.
		The System attribute of a FrameSet is the same as that of its current Frame (as specified by the Current attribute).
		Whilst not an equatorial system by definition, the ICRS is very close to the FK5 (J2000) system and is usually treated as an equatorial system.
	star-www.rl.ac.uk /star/docs/sun210.htx/node404.html (788 words)

	CalendarHome.com - Spacetime - Calendar Encyclopedia
		The relation between the two sets of measurements is given by a non-singular coordinate transformation on this intersection.
		This is Galilean-Newtonian relativity, and the coordinate systems are related by Galilean transformations.
		In general relativity, it is assumed that spacetime is curved by the presence of matter (energy), this curvature being represented by the Riemann tensor.
	encyclopedia.calendarhome.com /Spacetime.htm (1788 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		For studies of more distant extragalactic objects, the most natural coordinate system is supergalactic coordinate system.
		Supergalactic longitude, SGL, is measured counterclockwise from direction l = 137.37 deg, b = 0 deg.
		Supergalactic latitude, SGB, is measured from the supergalactic plane, positive northwards and negative southwards.
	www.astro.utu.fi /EGal/CooC/CooC8help.html (95 words)

	[No title]
		The default ilngunits and ilatunits values are hours and degrees for the equatorial coordinate systems and degrees and degrees for the remaining sky coordinate systems.
		This coordinate system is the one used by the image input/output routines to access the image on disk.
		Using an image whose header coordinate system is equatorial FK5 equinox 2000.0 and a different image of the same region whose coordinate system is galactic use the image display and cursor to create a list of tie points in logical pixel coordinates that can be used as input to the registration tasks geomap and geotran.
	www-cr.scphys.kyoto-u.ac.jp /member/sakano/manual/man/skyctran (2446 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		the input coordinates are in the equatorial fk4, noefk4, fk5,
		GLAT for the galactic coordinate system, and SLON / SLAT for the
		epoch for the FK4 system, a Julian epoch for the FK5 system.
	obswww.unige.ch /~segransa/optique_adaptative/aobprocs/ccmap.html (4656 words)

	Space-Time Coordinate Metadata for the Virtual Observatory (Site not responding. Last check: 2007-11-03)
		The Coordinate Area class defines the volume in coordinate space that is occupied by the object it is attached to.
		If the coordinate system is defined on the surface of a body (rather than the celestial or unit sphere), one should multiply by the square of the radius.
		It is specified by a center position and size (in both coordinates) defining a cross centered on the center position and with arms extending, parallel to the coordinate axes at the center position, for half the respective sizes on either side.
	hea-www.harvard.edu /~arots/nvometa/v1.2/STC.html (6623 words)

	Ahelp: prop-coords - CIAO 3.3
		Defined conceptually by the Galactic plane and the Galactic center, galactic longitude l and galactic latitude b are the IAU 1958 system, formerly called lII and bII.
		Supergalactic longitude and latitude, SGL and SGB, are defined by
		Since ecliptic coordinates are weakly epoch dependent, you can use a specific epoch to define the orbital plane other than the default B1950.0.
	asc.harvard.edu /ciao3.3/ahelp/prop-coords.html (540 words)

	IRAF Help page for "skyxymatch" (V2.10.4p2)
		The reference image celestial coordinates are transformed to input image celestial coordinates using world coordinate system information in both the reference and the input image headers.
		The currently permitted values of CTYPE[1:4] are RA-- / DEC- for equatorial coordinate systems, ELON / ELAT for the ecliptic coordinate system, GLON / GLAT for the galactic coordinate system, and SLON / SLAT for the supergalactic coordinate system.
		The ras and decs are in columns 3 and 4 of the input coordinate file and are in hh:mm:ss.ss and dd:mm:ss.s format respectively.
	ecf.hq.eso.org /scripts/irafhelp?skyxymatch (2182 words)

	Coordinate Plane (Site not responding. Last check: 2007-11-03)
		Galactic coordinate system - Many galaxies, including the Milky Way in which our Sun and Earth are located, are disk-shaped: the majority of their visible mass (excluding possible dark matter) lies very close to a plane.
		It is sometimes convenient to use this galactic plane as the basis of a galactic coordinate system, where the directions perpendicular to the plane point to the galactic poles, creating a spherical coordinate system.
		Cylindrical coordinate system - The cylindrical coordinate system is a three-dimensional system which essentially extends circular polar coordinates by adding a third coordinate (usually denoted h) which measures the height of a point above the plane.
	slo21.morgan-i.com /coordinateplane.html (1318 words)

	Celestial Coordinates Toolbox (Site not responding. Last check: 2007-11-03)
		The choices available cover: FK5, FK4, FK4 with no E terms, Ecliptic, Galactic and SuperGalactic coordinates, just choose the system that you are after using the "System:" menu button and qualify it with an appropriate equinox and epoch, if necessary.
		This will make the sky coordinate position readouts change, and any grid overlay (although you can modify the coordinates that a grid is plotted in using methods in the grid plotting window).
		That selects from the systems already associated with your image, this window adds a new system by transforming from any existing celestial coordinates (so some celestial coordinates must already be available).
	star-www.rl.ac.uk /star/help/gaia.htx/system.html (157 words)

	The SX Query Language
		RA coordinates are restricted to be between -90,+90 degrees.
		There are several special-purpose keywords in the query language for macros, coordinate conversions and SXQL syntax.
		Macro returning objects within the polygonal area given by the N coordinate pairs in the given coordinate system.
	www.sdss.jhu.edu /ScienceArchive/sxqt/sxQT/SX_Query_Language.html (1034 words)

	[No title]
		This is the longitude in a generic longitude/latitude coordinate system.
		In the equatorial system, FK4 is the default for coordinate with equinox prior of year 2000, and FK5 after this date.
		The new coordinates are written in the output file as the last fields of the record.
	db.ira.cnr.it /dira2/manual/section2.5.3.html (1111 words)

	12. Proposal Planning Tools (Site not responding. Last check: 2007-11-03)
		Conversions involving supergalactic coordinates are only available in the CLI version.
		While the coordinate system in most widespread use among astronomers is the B1950.0 system of equatorial coordinates, the International Astronomical Union (IAU) has recommended that J2000.0 coordinates be used.
		Type f or from to select a new input coordinate system (B1950 is the default.) Type c or convert to enter the processing level, or to enter the setup level if currently in the processing level.
	ledas-cxc.star.le.ac.uk /udocs/docs/POG/MPOG/node18.html (7158 words)

	Coordinate System
		The GIPSY coordinate system is implemented in terms of a collection of mostly FITS-compatible GDS descriptor items.
		For sky systems the rotation angle of the sky plane with respect to the axes is stored in CROTAn, where n is the number of the latitude axis.
		The projection of sky coordinates onto grids is done with function PROCO; transformation of equatorial coordinates from one epoch to another are done with subroutine EPOCO.
	www.astro.rug.nl /~gipsy/pguide/coordinates.html (784 words)

	Wikidpedia - The free online encyclopedia - Coordinate system (Site not responding. Last check: 2007-11-03)
		Xbox 360 Console Core System (Includes: Xbox 360, wired controller and composite TV connection and SCART adaptor)
		Inertial Coordinate System on the Sky (International Astronomical Union Symposia)
		Chicagoland Seven County Street Atlas: Includes the Chicagoland Grid Coordinate System: Chicago, Suburban Cook County, DuPage County, Kane County, Ken
	www.pagerank10.co.uk /wiki/?title=Coordinate_system (798 words)

	New Celestial Coordinates Task - SKYCTRAN (Site not responding. Last check: 2007-11-03)
		Skyctran supports the equatorial (fk4, fk4 [no e terms], fk5, geocentric apparent), ecliptic, galactic, and supergalactic celestial coordinate systems, as well as the iraf mwcs (logical, tv, physical, and world) systems.
		Coordinate transformations can be performed in place or new lists of input and output coordinates only can be written.
		Skyctran uses the iraf imio and mwcs libraries to attach celestial coordinate values to the image pixels and the Starlink positional astronomy library slalib to perform any required celestial coordinate transformations.
	iraf.noao.edu /new_stuff/skyctran.html (183 words)

	New Celestial Coordinates Task - IMCTRAN (Site not responding. Last check: 2007-11-03)
		Imctran currently supports the equatorial (fk4, fk4 [no e terms], fk5, geocentric apparent) coordinate systems on input and output, and the ecliptic, galactic, and supergalactic celestial coordinate systems on output.
		A typical application of imctran is to precess the coordinate systems of a set of images to a common epoch.
		Imctran uses the iraf imio and mwcs libraries to attach celestial coordinate values to the input image pixels and the Starlink positional astronomy library slalib to perform any required celestial coordinate transformations.
	iraf.noao.edu /new_stuff/imctran.html (205 words)

	[No title]
		When the user define a coordinates window the window limits are rounded but only the data inside your coordinates limits are shown.
		When this parameter is set to 1 the equator (of the equatorial coordinate system) is drawn on the screen at the execution of the 'GRId' command The command COOrdinate sets the type of coordinates in use in the map.
		When you have equatorial coordinates only, in a catalogue, you can draw a plot in galactic or supergalactic coordinates by this command.
	db.ira.cnr.it /dira2/manual/section2.6.2.html (1272 words)

	starcat/help_commands (Site not responding. Last check: 2007-11-03)
		Several coordinate systems are available and for some, an equinox can be specified.
		Depending upon the coordinate system chosen, the position specified will be either a longitude and latitude or a right ascension and declination.
		The documentation system is context senstive, i.e., when you ask for documentation using the Doc command you will receive documentation relevent to your current context.
	cadcwww.dao.nrc.ca /starcat/help_commands.html (2586 words)

	2MASS XSC Explanatory Supplement
		The "red" sources defining the Galactic Plane are mostly Milky Way in origin, both heavily dust reddened as well as being intrinsically red (due to strong emission lines in the Ks-band window).
		The Galactic anti-center region (center of image) is also graced by the Orion and Taurus molecular cloud systems (Orion located just right and down from the center of the image, Taurus just right and up from the center).
		The map is projected with an equal area aitoff in the SuperGalactic system (representing the plane of the Local Supercluster, including the Virgo-Coma supercluster of galaxies.) The plane of the Milky Way runs vertically across the image, with the Galactic Center to the upper right.
	spider.ipac.caltech.edu /staff/jarrett/2mass/XSC/jarrett_allsky.html (916 words)

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