apparent horizon

noun

A surface that is the boundary between lightrays that are directed outwards and moving outwards and those directed outward but moving inward.

Similar
horizonvisible horizonsensible horizonskyline
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Meanings

nounapparent horizon (plural apparent horizons)

plural apparent horizons

  1. astrophysicsA surface that is the boundary between lightrays that are directed outwards and moving outwards and those directed outward but moving inward.

Synonyms & antonyms

nounthe line at which the sky and Earth appear to meet

Similar
horizonvisible horizonsensible horizonskyline
Broader
line
Also see
horizonskyline

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

apparent horizon. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/apparent%20horizon

MLA

“apparent horizon.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/apparent%20horizon. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “apparent horizon,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/apparent%20horizon.

Source: apparent horizon on Wiktionary, CC BY-SA 4.0.