![]() ![]() The duration of each twilight phase depends on the latitude and the time of the year. It marks the beginning of astronomical twilight.Īstronomical terms & definitions Timing and Length 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. Business Date to Date (exclude holidays)ĭifferent 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. ![]()
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