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Length of twilight ALWAYS depends on latitude. At high latitudes the sun rises and sets at more of an angle and therefore twilight persists longer after sunset. Even in December, twilight persists longer at latitude 45 than it does at latitude 20, both summer and winter. At latitude 68 twilight still occurs in late December - for several hours in fact, even if the sun never makes it over the horizon.
Not sure what you mean by more light in summer than darkness in winter. I'll have to think about that one.
The longest day here is 15hrs and 28min while the longest night is only 15hrs 06mins. That's a 22 minute difference which may not seem like much but over weeks it makes a difference. We're already back to 15 hours of night by January 3rd but it takes until July 19th to get back to 15 hours of daylight in the summer.
Factor in twilight and light is dominating in summer far more than darkness ever does in winter. In fact, it takes until mid-October here for darkness to completely dominate whereas by early March we already have more light than darkness thanks to twilight.
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