Heliocentric Earth Equatorial

The Heliocentric Earth Equatorial frame is defined as follows: - X-Y plane is the solar equator of date, therefore, the +Z axis is the primary vector and it is aligned to the Sun's north pole of date; - +X axis is defined by the intersection between the Sun equatorial plane and the solar central meridian of date as seen from the Earth. The solar central meridian of date is defined as the meridian of the Sun that is turned toward the Earth. Therefore, +X axis is the component of the Sun-Earth vector that is orthogonal to the +Z axis; - +Y axis completes the right-handed system; - the origin of this frame is the Sun's center of mass. All vectors are geometric: no aberration corrections are used.

http://www.voparis-ns.obspm.fr/rdf/ihdea/treps-coordinate-system-names#HEEQ

The Heliocentric Earth Equatorial frame is defined as follows: - X-Y plane is the solar equator of date, therefore, the +Z axis is the primary vector and it is aligned to the Sun's north pole of date; - +X axis is defined by the intersection between the Sun equatorial plane and the solar central meridian of date as seen from the Earth. The solar central meridian of date is defined as the meridian of the Sun that is turned toward the Earth. Therefore, +X axis is the component of the Sun-Earth vector that is orthogonal to the +Z axis; - +Y axis completes the right-handed system; - the origin of this frame is the Sun's center of mass. All vectors are geometric: no aberration corrections are used.

Heliocentric Earth Equatorial

HEEQ

Heliocentric Earth Equatorial

http://www.w3.org/2002/07/owl#Thing