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Time measurement: Solar Time

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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

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