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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.
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Anatomy of Twilight Twilight is defined by the position of the sun and can be further categorized according to the following positions below the horizon (in degrees): Civil twilight less than 6 degrees Nautical twilight 6-12 degrees Astronomical twilight 12-18 degrees The blue hour is mostly observed during civil twilight and most of the nautical twilight.
Surreal twilight by Slepukhin-Zamachnaia, Tatiana / PSA Journal
During the hours of nautical twilight (darkness), the ammunition should be moved to the ASP holding area.
Army and Marine joint ammunition operations: the Army and Marine ... by Dowling, Glen R. / Army Logistician
Nighttime was classified as the period between the time of the first evening record after nautical twilight until the time of the last morning record before nautical twilight.
Vertical movement patterns of skipjack tuna (Kotsuwonus pelamis) in ... by Schaefer, Kurt M.; Fuller, Daniel W. / Fishery Bulletin
 
 
 
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