What is another word for apparent horizon?
Pronunciation: [ɐpˈaɹənt həɹˈa͡ɪzən] (IPA) 
The apparent horizon is the line in the distance where the sky appears to meet the earth. It is often used in navigation and astronomy. Synonyms for the apparent horizon include the visible horizon, the sightline, the skyline, and the eye-level horizon. Other synonyms for the horizon itself include the boundary line, the horizon line, and the skyline. The horizon can also be referred to as the vanishing point, the point of convergence, or the meeting point. All of these terms describe the same concept of the point in the distance where the sky and earth appear to meet.
