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Reference systems: Rect.Heliocentric-ICRF<br />
Heliocentric – [I;J;K]<br />
International Celestial Reference<br />
Frame (1998 IAU)standard<br />
reference system<br />
Centre: <strong>Solar</strong> system baricentre<br />
Ecliptic Pole: Celestial Sphere ∩ Normal to Ecliptic<br />
Coordinates:<br />
[X;Y;Z]<br />
I≅γ; K≅Ecl.Pole<br />
Notes:<br />
<strong>Time</strong> and observer independent<br />
On wide time windows γ=γ(t) ⇐Equinoxes precession and nutation