The - Ecliptic (plane)
- Ecliptic latitude
- Ecliptic longitude
- Vernal Equinox (used like the Greenwich Meridian)
In the most usual rectangular system, the X-Y plane is the Ecliptic and the X axis is the Vernal Equinox. Coordinates are three dimensional, and indicate a radius (equivalent to the distance to the object) for which 1 can be used if distance to the object is not intended to be specified. coordinate system,celestial sphere)Referenced by:
Celestial Coordinate System Ecliptic Equinox J Designator |