On 19 August, Nautical Twilight was 04 : 31 and sunrise 05 : 50.
2.
Of particular concern to landing craft, H-Hour was fixed forty minutes after nautical twilight.
3.
Nautical twilight has military considerations as well.
4.
Star and planet sights are normally taken during nautical twilight at dawn or dusk, while both the heavenly bodies and the sea horizon are visible.
5.
This is followed by the nautical twilight, when the sun reaches heights of-6?and-12? after which comes the astronomical twilight defined as the period from-12?to-18?
6.
The helicopters would land just after the start of morning nautical twilight, as mission planners weighed the options of attacking under the cover of darkness or during daylight hours.
7.
This is followed by nautical twilight, when the sun reaches heights of 6?and 12? after which comes astronomical twilight, defined as the period from 12?to 18?
8.
This is a writer who knows the difference between a lead line and an air baffle, civil twilight and nautical twilight, and he writes about boats and icy seascapes with poetic pleasure.
9.
After the sun has also set for these altitudes at the end of nautical twilight, the intensity of light emanating from earlier mentioned lines decreases, until the oxygen-green remains as the dominant source.
10.
The lowest latitudes at which the various twilights can continue through local midnight are approximately 60.561?( 60?32 433 ) for civil twilight, 54.561?( 54?32 433 ) for nautical twilight and 48.561?( 48?32 433 ) for astronomical twilight.
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