Daylight for stars to have accurate colours, but I don't do nightscapes, I shoot landscapes and I shoot sky, but not together. Nightscapes are effected by light pollution and it depends on the shot you take how you choose to process the white balance. Its a meaningless question, there is no rule for nightscapes since they can contain fluoros and sodiums and incandescents plus sky glow so you cant talk about accurate colours unless to define which part of a particular photo you are talking about.
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