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Reference systems: Aries point<br />
Alternative definitions: γ point (Aries point)<br />
•Earth-to-Sun alignment points to the Aries Constellation (Vernal Equinox)<br />
• Line that has:<br />
•direction: E∩Π E= ecliptic plane; Π=Celestial Equator plane;<br />
•versus: positive whenever the Sun rises from the bottom to the top of the Π<br />
plane<br />
Ecliptic North<br />
Pole (K) 23.<br />
5°<br />
Boreal Pole<br />
(PNC)<br />
Ecliptic<br />
North Pole<br />
23.5°<br />
Boreal Pole<br />
(PNC)<br />
Earth Orbit<br />
Sun Apparent Orbit<br />
Austral Pole<br />
γ<br />
Celestial<br />
sphere<br />
Celestial<br />
Equator<br />
Austral Pole<br />
γ<br />
Celestial<br />
Equator<br />
Celestial<br />
Sphere<br />
Eliocentric reference<br />
Geocentric reference<br />
Ecliptic plane: plane of the apparent motion of the Sun around the Earth in one year