Sometimes,observers see this as a comet's tail, which can be visible to the unaided eye stretching across the night sky.

VOA: special.2011.02.09

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

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