Celestial Longitude

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Celestial Longitude

Angular distance east of the vernal equinox, along the ecliptic; the arc of the ecliptic or the angle at the ecliptic pole between the circle of latitude of the vernal equinox and the circle of latitude of a point on the celestial sphere, measured eastward from the circle of latitude of the vernal equinox, through 360. See ecliptic system of coordinates.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use