What is another word for celestial horizon?
Pronunciation: [səlˈɛstjə͡l həɹˈa͡ɪzən] (IPA) 
The term "celestial horizon" refers to the boundary or line where the earth meets the sky. It is often used in astronomy to describe the position of stars, planets, and other celestial bodies. There are several synonyms for this word, including "zenith," which refers to the highest point in the sky, and "nadir," which refers to the lowest point. Other synonyms include "azimuth," which refers to the angle of a celestial body relative to the observer's horizon, and "altitude," which refers to the height of a celestial body above the observer's horizon. Regardless of the term used, celestial horizons have been essential for humans to navigate the stars and map the universe.
