What is another word for apparent horizons?
Pronunciation: [ɐpˈaɹənt həɹˈa͡ɪzənz] (IPA) 
Apparent horizons refer to the visible edges of objects or areas that one can see from a certain point. They can be synonyms with phrases such as visual boundaries, observable limits or perceivable borders. Other synonyms include noticeable demarcations, clear cut-offs, and conspicuous thresholds. These terms all refer to the visible or perceivable boundaries that one can observe in a certain space, whether it is physical or abstract. These are useful, especially in fields such as astronomy where apparent horizons can indicate the limits and boundaries of celestial bodies. Synonyms for this term can also be found in the fields of geography, architecture, and other forms of spatial analysis.
