![]() ![]() Sailors can navigate, using a visible horizon as reference.ĭuring astronomical twilight the center of the sun is between 12 and 18 degrees below the horizon. Objects are clearly distinguished without artificial light.ĭuring nautical twilight the center of the sun is between 6 and 12 degrees below the horizon. ![]() During civil twilight the geometric center of the sun is between 0 and 6 degrees below the horizon.
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