Astrophysics (index)

Ecliptic Coordinate System

(celestial coordinate system system based upon Earth's orbital plane)

The Ecliptic Coordinate System is a spherical coordinate system used for directions in the Celestial Sphere, fixed to the path of the Sun in the sky as seen from Earth, i.e., the Ecliptic. The name, and the ecliptic are also used with rectangular coordinates. Spherical elements:

  • 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
J Designator