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Time of the year’s earliest sunset
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I imagine those regions are effectively in 24 hours of darkness at that point
You'd be surprised what some sunlight will do vs none at all. But the light that does come is very low on the horizon making it feel like sunrise/sunset and then it's gone again.
I can't tell you about 24h of darkness, but I would love to experience a few weeks of 24h daylight! But only as a tourist. LOL