celestial longitude

noun Astronomy.
the angular distance of a point on the celestial sphere from the great circle that is perpendicular to the ecliptic at the point of the vernal equinox, measured through 360° eastward parallel to the ecliptic.
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World English Dictionary
celestial longitude
 
n
Also called: ecliptic longitude the angular distance measured eastwards from the vernal equinox to the intersection of the ecliptic with the great circle passing through a celestial body and the poles of the ecliptic

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American Heritage
Science Dictionary
celestial longitude  
The position of a celestial object east of the vernal equinox along the ecliptic. Celestial longitude is measured in degrees eastward from the vernal equinox (0°) to the point where a great circle drawn through the object and the poles of the ecliptic intersects the ecliptic. Compare celestial latitude. See more at ecliptic coordinate system.
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Celestial longitude is measured in the ecliptic eastward from the vernal equinox.
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