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Time measurement: Solar Time

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Reference systems: Spherical<br />

Celestial Equatorial Reference<br />

geocentric – [γ PNC]<br />

Celestial North Pole (Boreal Pole) PNC<br />

Celestial Sphere apparent rotation<br />

γ<br />

E<br />

α<br />

δ<br />

Celestial<br />

Sphere<br />

Celestial Equator<br />

Austral Pole<br />

Celestial North Pole: Celestial Sphere ∩ Earth rotation axis<br />

Coordinates: Right Ascension; Declination: 0°

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