true celestial equator — An Etymological Dictionary of Astronomy and Astrophysics

true celestial equator

هموگار ِ آسمانی ِ راستین

hamugâr-e âsmâni-ye râstin

Fr.: équateur céleste vrai

The → celestial equator of date, which is the → great circle on the → celestial sphere perpendicular to the instantaneous axis of rotation of the Earth. Its interaction with the → ecliptic defines the → vernal equinox of date and the → autumnal equinox of date.

See also: → true; → celestial; → equator.

An Etymological Dictionary of Astronomy and Astrophysics