In the Expanse books, there’s a planet called Auberon that has an 8 hour rotation, so 4 hours of light and 4 hours of dark. They decided that “1 day” would be light-dark-light and “1 night” is dark-light-dark. It’s really interesting how they describe the way society adapts to the cycle of having a midnight sun and both a midmorning and evening sunset.
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