![]() ![]() Similarly, nautical dusk is the instant when the geometric center of the Sun is 12 degrees below the horizon in the evening. Nautical dawn is the moment when the geometric center of the Sun is 12 degrees below the horizon in the morning. However, unlike the term twilight, which describes a time span, the terms dawn and dusk refer to exact moments during the transitions between day and night. ![]() This is why it is called nautical twilight.įind the planets in the night sky Nautical Dawn and Nautical Duskĭifferent degrees of twilight in the twilight phases in the morning are also colloquially called dawn, while the twilight phases in the evening are referred to as dusk. Many of the brighter stars can also be seen, making it possible to use the position of the stars in relation to the horizon to navigate at sea. In clear weather conditions, the horizon is faintly visible during this twilight phase. During nautical twilight, the geometric center of the Sun's disk is between 6 and 12 degrees below the horizon. The 3 twilight phases on a world map Nautical TwilightĮach twilight phase is defined by the solar elevation angle, which is the position of the Sun in relation to the horizon. Astronomers differentiate between 3 phases: Twilight is the time between day and night when the Sun is below the horizon but its rays still light up the sky. The moments when 99% of people see sunlight ![]() During nautical twilight, both the horizon and the brighter stars are usually visible. Business Date to Date (exclude holidays). ![]()
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