Nautical Twilight
This period is less bright than civil twilight.Artificial light is needed for outdoor activities
Nautical twilight occurs when the center of the sun is between 6 and 12 degrees below the horizon
Nautical dawn is the time when the sun is 12 degrees below the horizon in the morning.
Nautical dusk is when the sun is 12 degrees below the horizon in the evening
"Nutical twilight" has been used since the time when sailors used the stars to navigate, to the today's US military forces' Begin Morning Nautical twilight (BMNT) and End Evening Nautical Twilight (EENT) protocols
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