The "nightfall sky" refers to the appearance of the sky during the transition from daylight to night, specifically the time of day when the sky gets dark, and when night begins.
In essence, it's the sky seen during dusk or twilight. Here's a more detailed breakdown:
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Transition: It marks the gradual change from the brightness of day to the darkness of night.
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Timeframe: This period is characterized by the fading of sunlight and the emergence of stars and other celestial objects.
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Visual Characteristics: The nightfall sky often features a range of colors, from deep blues and purples to oranges and reds, depending on atmospheric conditions and the setting sun.
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Beginning of Night: As the reference states, nightfall signifies the beginning of night.
