In astronomy, there's something called being "tidally locked." That is, something orbiting something else has its own rotation equal the orbit period. In fact, our own moon is tidally locked with the Earth. We only ever see one side of it. If the Earth were a star, the part of the Moon that was towards us would always be light, while the other side would always be dark. That's what's happening in Siran, a world that has part always in light and part always in shadow. You can adventure in this world in the Between Sun & Shadow: Second Edition book that's up on Kickstarter now.
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