Ecliptic Coordinates
Wiley Book of Astronomy:
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ecliptic coordinates
A system that uses the plane of the ecliptic as a reference plane. Ecliptic coordinates of objects with respect to the center of Earth, known as geocentric ecliptic coordinates, are given in terms of celestial latitude (the perpendicular distance of the orbit from the ecliptic in angular measure) and celestial longitude (the angular distance along the ecliptic between the plane through the object and the vernal equinox). Ecliptic coordinates that refer to the center of the Sun, known as heliocentric ecliptic coordinates, are given in terms of heliocentric latitude and heliocentric longitude.
Oxford Dictionary of Astronomy:
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Ecliptic Coordinates
A system of coordinates that specifies the position of an object in the Solar System relative to the plane of the Earth's orbit, the ecliptic. Ecliptic coordinates of objects as they would be seen from the centre of the Earth (i.e. geocentric ecliptic coordinates) are given in terms of celestial latitude and celestial longitude (also known as ecliptic latitude and longitude). Ecliptic coordinates of objects as they would be seen from the centre of the Sun (i.e. heliocentric ecliptic coordinates) are given in terms of heliocentric latitude and heliocentric longitude.
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Wiley Book of Astronomy
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