What is the meaning of apparent horizon?

(DoD, NATO) The visible line of demarcation between land/sea and sky.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). apparent horizon. Retrieved September 24, 2026, from http://smartdefine.org/apparent_horizon/definitions/1960372
ChicagoMilitary Dictionary (DoD). 2011. "apparent horizon" http://smartdefine.org/apparent_horizon/definitions/1960372 (accessed September 24, 2026).
HarvardMilitary Dictionary (DoD) 2011, apparent horizon, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/apparent_horizon/definitions/1960372>.
MLAMilitary Dictionary (DoD). "apparent horizon" 4 April 2011. Web. 24 September 2026. <http://smartdefine.org/apparent_horizon/definitions/1960372>
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