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nautical twilight |
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nautical twilight [′nȯd·ə·kəl ′twī‚līt] (astronomy) The interval of incomplete darkness between sunrise or sunset and the time at which the center of the sun's disk is 12° below the celestial horizon. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The event must be at night beyond the end of evening nautical twilight and prior to begin morning nautical twilight. As before morning nautical twilight (BMNT) approached, visibility continued to increase as the first spot reports were sent to the brigade fire support element (FSE). |
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