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true pole
The direction toward which Earth's axis points at a given time. The true equator is the great circle on the celestial sphere drawn perpendicular to this direction. The true equinox is the intersection of the ecliptic (the plane of Earth's orbit) with the true equator.
Related category
• CELESTIAL MECHANICSAlso on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History