At astronomical dusk, the Sun's position is 18° below the horizon in the evening.
At this time, objects are less distinguishable, and stars and planets appear to brighten. It marks the end of nautical twilight, which begins at civil dusk. At nautical dusk, the Sun apparently moves to 12° below the horizon in the evening.Beyond this point artificial light may be needed to carry out outdoor activities, depending on atmospheric conditions and location. The sky has many colors at this time, such as orange and red. At this time objects are still distinguishable and depending on weather conditions some stars and planets may start to become visible to the naked eye. It marks the end of civil twilight, which begins at sunset. At civil dusk, the center of the Sun's disc goes 6° below the horizon in the evening.Astronomical twilight as seen from a plane window
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