Nautical Twilight Calculator
Nautical dawn and nautical dusk for your chosen location and date, when the sun is 6–12° below the horizon.
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Nautical Twilight Calculator settings
Times are calculated, not measured, and are typically accurate to within about a minute. Actual sunrise/sunset can shift slightly with elevation and local horizon obstructions.
What is nautical twilight?
What is nautical twilight? Nautical twilight is when the sun is between 6° and 12° below the horizon. Traditionally, this is the period when the horizon is just visible at sea for taking a star sighting, hence the name.
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