What is another word for equinoctial lines?
Pronunciation: [ˈɛkwɪnˌɒkʃə͡l lˈa͡ɪnz] (IPA) 
Equinoctial lines, also known as the celestial equator or celestial equinox, are imaginary circles in the celestial sphere that intersect at the celestial poles. These lines mark important astronomical events, including the equinoxes when the length of day and night are equal. When referring to these lines, there are several synonyms that can be used, including the equinoctial circle, the equatorial line, the equatorial circle, and the celestial equator. All of these terms refer to the same imaginary line that runs east to west along the sky, marking the point where the plane of the Earth's equator intersects with the celestial sphere.
