The lighthouse stood out starkly against the dark sky.

在黑暗的天空映衬下，灯塔巍然兀立。

《牛津词典》

The sky is turning dark.

天渐渐暗了。

youdao

The sky suddenly went dark and it started to rain.

天空骤然转暗，随即下起雨来。

《牛津词典》

Rockets explode to fill the dark, night sky with bright reds and blues, with yellows and greens and whites.

VOA: special.2010.07.04

The Evening Star is the, roughly speaking, first heavenly body that's visible in the sky as it gets dark, at least at certain times of the year.

粗略说来,昏星就是,天黑时第一个能看见的天体,至少在一年的某个时间段是这样

耶鲁公开课 - 死亡课程节选

Max Arthur Cohn's painting "Coal Tower" shows the dark form of a coal tower against a light sky.

VOA: special.2009.03.23

The UK's first dark sky park at Galloway forest was established after being granted the Dark Sky status by the IDSA in 2009.

BBC: Northumberland Park bid for dark sky status given backing

Hours later, with the night sky dark, protesters re-entered the park in single file, after they were allowed back in, as long as they didn't bring camping equipment.

WSJ: Bloomberg's Bum Rush Backfires

The sky was dark, and he had parked the car on a quiet street.

NEWYORKER: Election, Monitored