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Ecliptic coordinate system

prefLabel	Ecliptic coordinate system
altLabel	Ecliptic
narrower	Ecliptic latitude Ecliptic longitude Ecliptic poles
inScheme	The Unified Astronomy Thesaurus
broader	Astronomical coordinate systems
Abstract from DBPedia	The ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions, orbits, and pole orientations of Solar System objects. Because most planets (except Mercury) and many small Solar System bodies have orbits with only slight inclinations to the ecliptic, using it as the fundamental plane is convenient. The system's origin can be the center of either the Sun or Earth, its primary direction is towards the vernal (March) equinox, and it has a right-hand convention. It may be implemented in spherical or rectangular coordinates. 黄道座標（こうどうざひょう、ecliptic coordinate system）は、天球上の天体の位置を表すための天球座標系の一種で、黄道を基準とする座標系である。 (Source: http://dbpedia.org/resource/Ecliptic_coordinate_system)