![]() 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.
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