New York, USA

Lat: 40.71°•Lon: -74.01°

NAUTICAL MARITIME TWILIGHT

10:43 PM

Sea horizon is distinguishable; 57 navigational stars become observable

First Light (Civil Dawn)11:49 AM

Sunrise12:20 PM

Solar Noon04:59 PM

Sunset09:38 PM

Last Light (Civil Dusk)10:09 PM

True Night (Astro Dusk)11:17 PM

Nautical Dusk Calculator (Loss of Horizon)

Sun Descends Past -12°•Loss of Sea Horizon Line•Navigational Star Emergence•Live Countdown to Maritime Dark

Track the Moment the Horizon Dissolves into the Sea

Nautical dusk occurs in the evening when the geometric center of the sun descends 12 degrees below the astronomical horizon. At this instant, the horizon line ceases to be distinguishable against the darkening sky, concluding evening maritime navigation sights.

Track the progression from sunset to nautical dusk with real-time solar coordinates and a live countdown to true sea darkness.

How to Use the Nautical Dusk Calculator

Select your coastal departure city or enter offshore coordinates.

Note the exact timestamp when nautical twilight concludes.

Wrap up evening sextant sights before the horizon vanishes into the night.

Explore More Free Online Tools

Analog Clock Digital Clock Online Clock Word Clock World Clock Water Clock Interactive Teaching Clock Online Alarm Clock

Frequently Asked Questions

What is nautical dusk?

Nautical dusk is the instant in the evening when the geometric center of the sun reaches 12 degrees below the horizon, marking the end of nautical twilight.

What can you see at nautical dusk?

At nautical dusk, the sea horizon is no longer distinguishable and all primary navigation stars are visible to the naked eye.

How long after sunset does nautical dusk occur?

In mid-latitudes, nautical dusk typically occurs between 60 and 80 minutes after sunset.

Ready to Use the Nautical Dusk Calculator?

Scroll up to start using this tool immediately with zero setup required.