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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°