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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."

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11y ago
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1mo ago

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.

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Q: How dark is nautical twilight?
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