Weather Dictionary / Glossary of Terms

Nautical Twilight


   Weather TermDescription / Definition
   Nautical Twilight The time after civil twilight, when the brighter stars used for celestial navigation have appeared and the horizon may still be seen. It ends when the center of the sun is 12 degrees below the horizon, and it is too difficult to perceive the horizon, preventing accurate sighting of stars.


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Data courtesy of NOAA - National Oceanic and Atmospheric Administration