According to the United States Naval Observatory,
"At the beginning or end of nautical twilight, under good atmospheric conditions and in the absence of other illumination, general outlines of ground objects may be distinguishable, but detailed outdoor operations are not possible. During nautical twilight the illumination level is such that the horizon is still visible even on a Moonless night allowing mariners to take reliable star sights for navigational purposes, hence the name."
Nautical twilight is the time when the horizon is still visible at sea, but the sky is quite dark, making it difficult to discern details. It occurs when the sun is between 6 and 12 degrees below the horizon.
For the times of nautical and civil twilight you need to refer to a nautical almanac.
daybreak. another name is twilight. It is recognized by the presence of weak sunlight. Twilight comes at three levels. Astronomical twilight- The sky is no longer completely dark. Nautical twilight- When the horizon and a few objects are distinguishable. Civil twilight- When there is enough light so objects can be distinguished and out door activities can be commensed. Also the same is true for sunset. only in reverse, starting with Civil twilight, Nautical twilight, Astrononmical twilight.
Dark Twilight was created in 1991.
Twilight of the Dark Master was created in 1997.
The duration of Twilight of the Dark Master is 2700.0 seconds.
its dusk not dark
Twilight is the time of day between sunset and darkness when the sky is partially illuminated. There are three types of twilight: civil twilight, nautical twilight, and astronomical twilight, with each stage gradually becoming darker. During twilight, the sky typically displays a range of colors from vibrant oranges and pinks to softer purples and blues.
laurant is also dark in the book
twilight
Twilight is when the sun is below the horizon- either has not yet risen, or has just set. Civil twilight- what most people mean when they say twilight- the sun is no more than 6 degrees below the horizon. There is also nautical twilight, where the sun can be as much as 12 degrees below the horizon. That time is used by sailors to take "sightings" on stars with a sextant for navigation. In Nautical twilight, you can see stars, but there is still a visible horizon to use in your sightings.
pretty dark. seriously: is there an empirical measure of darkness, or is this question unanswerable? Obviously this question is about "twilight". There are 3 technical definitions of twilight. The example in this question falls into the category of "nautical twilight" (Sun between 6 and 12 degrees below horizon). The sky should be bright enough for the sea horizon to be visible for navigation purposes. The actual brightness of the sky depends on weather conditions and the direction of observation.
in USA central timeAstronomical twilight begins: 10:07 Nautical twilight begins: 10:39 Civil twilight begins: 11:11 Sunrise: 11:37Transit (sun is at its highest): 12:10 Sunset: 22:44Civil twilight ends: 23:10 Nautical twilight ends: 23:42 Astronomical twilight ends: 00:13 on Friday 16th october 2009