(DoD) The beginning of morning nautical twilight; i.e., when the center of the morning sun is 12 degrees below the horizon.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
| APA | Military Dictionary (DoD). (2011). first light. Retrieved September 22, 2026, from http://smartdefine.org/first_light/definitions/1961723 |
| Chicago | Military Dictionary (DoD). 2011. "first light" http://smartdefine.org/first_light/definitions/1961723 (accessed September 22, 2026). |
| Harvard | Military Dictionary (DoD) 2011, first light, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/first_light/definitions/1961723>. |
| MLA | Military Dictionary (DoD). "first light" 4 April 2011. Web. 22 September 2026. <http://smartdefine.org/first_light/definitions/1961723> |