New York, USA
Lat: 40.71°•Lon: -74.01°
NAUTICAL MARITIME TWILIGHT
-4.1° Elevation
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 Twilight Calculator (-6° to -12°)
-6° to -12° Solar Altitude Band•Navigational Star Matrix•Sea Horizon Contrast Simulator•Real-Time Solar Depression Angle
Understand the -6° to -12° Maritime Twilight Zone
Nautical twilight spans the solar altitude range between 6 and 12 degrees below the horizon. During this window, artificial lighting is necessary on land, but at sea, the ambient light creates a crisp boundary between water and sky while bright navigational stars like Polaris, Sirius, and Vega are easily visible.
Explore morning and evening nautical twilight times for any latitude, with an interactive horizon diagram demonstrating sea contrast.
How to Use the Nautical Twilight Guide
1
Choose your location or input maritime coordinates.
2
View the start, midpoint, and completion of the nautical twilight band.
3
Observe the emergence of prominent constellations and celestial navigation markers.
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Frequently Asked Questions
Why is it called nautical twilight?
Because historically, sailors used this specific period when both the sea horizon was visible and navigation stars were bright to calculate their latitude and longitude.
What is the solar angle during nautical twilight?
Nautical twilight occurs when the sun is between 6 and 12 degrees below the horizon.
Is there enough light to drive without headlights during nautical twilight?
No, driving during nautical twilight requires full headlights as road illumination from the sky is negligible.
Ready to Use the Nautical Twilight Guide?
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