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Topic: Ecliptic coordinate system

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Celestial coordinate system

Equatorial coordinate system

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	* Ecliptic - (Astronomy): Definition (Site not responding. Last check: 2007-09-19)
		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)...
		The ecliptic is tilted 23.5 degrees from the celestial equator...
		The orbit is inclined at 7.1° to the ecliptic...
	www.bestknows.com /astronomy/ecliptic.html (1732 words)

	Coordinate system - Wikipedia, the free encyclopedia
		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.
		Cylindrical coordinate system represents a point in space by an angle, a distance from the origin and a height.
	en.wikipedia.org /wiki/Coordinate_system (1119 words)

	Celestial coordinate system - Wikipedia, the free encyclopedia
		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.
	en.wikipedia.org /wiki/Celestial_coordinate_system (304 words)

	* Ecliptic - (Astronomy): Definition
		The ecliptic latitude is measured away from the plane of the ecliptic toward the ecliptic pole (positive to the north of the ecliptic) and the ecliptic...
		The ecliptic is the plane defined by the Earth's orbit around the Sun; conversely, in the course of a year, the sun traces a path in the sky along the ecliptic.
		The orbit is inclined at 10.6° to the ecliptic.
	en.mimi.hu /astronomy/ecliptic.html (1829 words)

	AllRefer.com - ecliptic coordinate system (Astronomy, General) - Encyclopedia
		ecliptic coordinate system, an astronomical coordinate system in which the principal coordinate axis is the ecliptic, the apparent path of the sun through the heavens.
		The ecliptic poles are the two points at which a line perpendicular to the plane of the ecliptic through the center of the earth strikes the surface of the celestial sphere.
		The north ecliptic pole lies in the constellation Draco.
	reference.allrefer.com /encyclopedia/E/ecliptic-c.html (187 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.
		The latitudinal angle is called the ecliptic latitude, and the longitudinal angle is called the ecliptic longitude.
	en.wikipedia.org /wiki/Ecliptic_coordinate_system (180 words)

	PHY 445/515: Coordinate Systems (Site not responding. Last check: 2007-09-19)
		The equator (the ecliptic) is the plane of the terrestrial orbit, projected onto the celestial sphere.
		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.
	www.ess.sunysb.edu /fwalter/PHY515/coords.html (428 words)

	AllRefer.com - ecliptic (Astronomy, General) - Encyclopedia
		The ecliptic is the principal axis in the ecliptic coordinate system.
		The obliquity of the ecliptic is the inclination of the plane of the ecliptic to the plane of the celestial equator, an angle of about 23 1/2 °.
		The constellations through which the ecliptic passes are the constellations of the zodiac.
	reference.allrefer.com /encyclopedia/E/ecliptic.html (221 words)

	Astronomical Leage - Astro Note 11: Celestial Coordinate Systems
		Coordinates are then specified by angular measure around the great circle from the reference point and by angular distance from the reference plane along another great circle perpendicular to that plane.
		Also called alt-azimuth or horizon coordinates, this system uses the plane of the local horizon as the plane of reference.
		That intersection where the Sun appears to cross the celestial equator from south to north is chosen as the reference point and is known as the vernal equinox.
	www.astroleague.org /al/astrnote/astnot11.html (607 words)

	Coordinate system - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-09-19)
		See Cartesian coordinate system or Coordinates (elementary mathematics) for a more elementary introduction to this topic.
		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 rotation of coordinate systems (http://en.wikibooks.org/wiki/Modern_Physics:Math:Vectors) is covered in depth on wikibooks.
	www.northmiami.us /project/wikipedia/index.php/Coordinate (798 words)

	Celestial Coordinate System
		It is useful to impose on the celestial sphere a coordinate system that is analogous to the latitude-longitude system employed for the surface of the Earth.
		This coordinate system is illustrated in the following figure (for which you should imagine the earth to be a point at the center of the sphere).
		In the celestial coordinate system the North and South Celestial Poles are determined by projecting the rotation axis of the Earth to intersect the celestial sphere, which in turn defines a Celestial Equator.
	csep10.phys.utk.edu /astr161/lect/time/coordinates.html (700 words)

	Matrix Astrology Software : Learn Astrology - Visual Astrology - Ecliptic Coordinate System (Site not responding. Last check: 2007-09-19)
		Ecliptic Coordinates -- In this system, the ecliptic or plane through the Earth's orbit is taken as the plane of reference.
		The co-ordinates used are Celestial Latitude (the perpendicular distance of the object from the ecliptic in angular measure) and Celestial Longitude (the angular distance along the ecliptic between the plane through the object and the First Point of Aries).
		Obliquity of the Ecliptic -- The 23 1/2° angle (23°27') that represents the inclination of the ecliptic to the celestial equator.
	www.thenewage.com /resources/vastrology/ecsys.asp?orig= (646 words)

	The Definition of the Babylonian Zodiac and the Influence of Babylonian Astronomy on the Subsequent Defining of the ...
		Thus the first astronomical coordinate system came into being, through which the positions of the stars and planets along the ecliptic could be determined between 0° and 30° within the twelve zodiacal signs.
		From this it is readily apparent that the two coordinate systems - that of the Babylonians (the sidereal zodiac) and the one favored in Greek astronomy (the tropical zodiac) - are intrinsically independent.
		As the tropical zodiac is still used as a coordinate system in modern astronomy, the uncovering of the line of descent from the solar calendar of the Babylonians to the tropical zodiac reveals the indebtedness of modern astronomy to its origins in Babylonian astronomy.
	www.astrologer.com /aanet/pub/transit/jan2005/babylonian.htm (1901 words)

	Matrix Astrology Software : Learn Astrology - Visual Astrology - The Zodiac or Ecliptic Coordinate System (Site not responding. Last check: 2007-09-19)
		Since every center for a coordinate system is surrounded by 360 equal degrees of space in any direction, we must have a plane to which all objects, stars, planets, etc. may be referred -- a reference plane.
		Every coordinate system must have a plane of reference that passes through the center of the system and which divides all space into two equal halves or hemispheres.
		We have mentioned, when speaking of the zodiac, that it is the plane of the Earth's orbit that is used as the fundamental reference plane for the ecliptic system of coordinates.
	www.thenewage.com /resources/vastrology/zcsys.asp?orig= (577 words)

	Attributes which Qualify Celestial Coordinate Systems (Site not responding. Last check: 2007-09-19)
		Many celestial coordinate systems have some additional free parameters which serve to identify a particular coordinate system from amongst a broader class of related coordinate systems.
		This value is used to qualify celestial coordinate systems that are notionally based on the Earth's equator and/or the ecliptic (the plane of the Earth's orbit around the Sun).
		Coordinates expressed in any of these systems vary with time due to movement (by definition) of the coordinate system itself, and must therefore be qualified by a moment in time (the epoch of the mean equinox, or ``equinox'' for short) which specifies the position of the model coordinate system on the sky.
	www.ast.man.ac.uk /~dsb/ast/sun211.htx/node87.html (523 words)

	Galactic coordinate system -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-19)
		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 (Click link for more info and facts about spherical coordinate system) spherical coordinate system.
		In actual usage, these terms are nearly always used to refer specifically to the plane and poles and coordinate system of the Milky Way rather than any other galaxy.
		The "zero of longitude" of galactic coordinates was also defined in 1959 to be at position angle 123° from the north galactic pole.
	www.absoluteastronomy.com /encyclopedia/G/Ga/Galactic_coordinate_system.htm (272 words)

	Astronomical Coordinate Systems
		The coordinate systems considered here are all based at one reference point in space with respect to which the positions are measured, the origin of the reference frame (typically, the location of the observer, or the center of Earth, the Sun, or the Milky Way Galaxy).
		The second coordinate of a position in the horizon system is defined by the point where the verticle circle of the position cuts the horizon.
		Ecliptical coordinates are most frequently used for solar system calculations such as planetary and cometary orbits and appearances.
	www.seds.org /~spider/spider/ScholarX/coords.html (3777 words)

	Coordinate system dimension field mathematical singularity matrix perpendicular Canonical coordinates Ecliptic ... (Site not responding. Last check: 2007-09-19)
		» Curvilinear coordinates are a generalization of coordinate systems generally; the system is based on the intersection of curves.
		File for the Clay County Coordinates Source: MnDot Origin: The Minnesota County Coordinate System was originally conceived by University of Minnesota surveying professor Gerald...
		Coordinate System Abstract This lesson is designed to familiarize students to the Cartesian Coordinate System and its many uses in the world of mathematics.
	en.powerwissen.com /wVadkOcz37MHFXnaS6ssOQ%3D%3D_Coordinate.html (862 words)

	[No title] (Site not responding. Last check: 2007-09-19)
		So, presumably, the origin of the ecliptic system is at the center of mass of the sun; the x-axis points to the vernal equinox, the y-axis points to the ecliptic zenith and the z-axis points +90 cartesian degrees from the x-axis (looking down, from zenith, onto the ecliptic plane.
		The origin of the equatorial system is at the center of mass of the specified planet; the x-axis points to the vernal equinox, the y-axis points to the north pole of the planet and the z-axis points +90 cartesian degrees from the x-axis (looking down, from the north pole, onto the planet's equatorial plane).
		Since the coordinate systems are not only different, with respect to Orbiter and my spreadsheet, but also different with respect to an ecliptic system and an equatorial system, therefore I want to understand the specifications of Orbiter's coordinate systems, so that I can have a basis for figuring out how to make the conversion.
	www.orbitersim.com /v2/read.asp?id=21355 (2990 words)

	Ecliptic coordinate system (Site not responding. Last check: 2007-09-19)
		The ecliptic is the path that the sun appears tofollow across the sky over the course of a year.
		The latitudinal angle is called the ecliptic latitude, andthe longitudinal angle is called the ecliptic longitude.
		If you guessed charting solar system objects, you're right!Each of the planets (except Pluto) orbits the sun in roughly the same plane, so they always appear to be somewhere near the ecliptic (i.e., they alwayshave small ecliptic latitudes).
	www.therfcc.org /ecliptic-coordinate-system-32599.html (169 words)

	P3001 Ecliptic Coordinates (Site not responding. Last check: 2007-09-19)
		The major planets and the sun are all aligned near perfectly in a single orbital plane.
		Because of the importance which astrology placed on the alignment of the planets, those constellations which lay in the ecliptic plane had special significance and are called the zodiac constellations.
		Another commonly used celestial coordinate system is based on the ecliptic - with coordinates being given as ecliptic longitude and ecliptic latitude (e.g.
	www.mta.ca /~rhawkes/courses/3001/ecliptic.html (92 words)

	Ecliptic coordinate system -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-09-19)
		The ecliptic is the path that the (A typical star that is the source of light and heat for the planets in the solar system) sun appears to follow across the sky over the course of a year.
		It is also the (Any structure that branches out from a central support) projection of the Earth's ((astronomy) the plane on which a body is orbiting) orbital plane onto the (The apparent surface of the imaginary sphere on which celestial bodies appear to be projected) celestial sphere.
		The (Click link for more info and facts about latitudinal) latitudinal angle is called the (Click link for more info and facts about ecliptic latitude) ecliptic latitude, and the (Click link for more info and facts about longitudinal) longitudinal angle is called the (Click link for more info and facts about ecliptic longitude) ecliptic longitude.
	www.absoluteastronomy.com /encyclopedia/E/Ec/Ecliptic_coordinate_system.htm (205 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.
		The ecliptic latitude is measured in degrees perpendicular to the ecliptic.
		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)

	vik dhillon: phy105 - the celestial sphere - the ecliptic coordinate system
		vik dhillon: phy105 - the celestial sphere - the ecliptic coordinate system
		In problems dealing with the positions and motions of solar system objects, however, it is often more convenient to refer positions to the mean orbital plane of the solar system using ecliptic coordinates.
		In Figure 17, the ecliptic latitude of the star X is given by the arc YX.
	www.shef.ac.uk /physics/people/vdhillon/teaching/phy105/phy105_ecliptic.html (155 words)

	Open Channel Foundation: SUNTRACKER
		The selenographic coordinate system is based on the equatorial plane of the moon.
		The origin of this system is referenced to the mean center of the apparent lunar disk.
		In 1981, a new analytic theory on the librations of the moon was adopted by The Astronomical Almanac.
	www.openchannelsoftware.org /projects/SUNTRACKER/&id=ntb (437 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)

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