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After this time the Sun no longer illuminates the sky, and thus no longer interferes with astronomical observations. It marks the end of astronomical twilight, which begins at nautical dusk.
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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.
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Astronomical twilight as seen from a plane window
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