this post was submitted on 08 Jul 2023
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Worldbuilding
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By binary planet system do you mean two planets or one planet circling two stars?
If it was tidally locked I don't think it would have days at all right? Since the same side will always be facing the stars in the center (Apparently not always true actually - check out tidal locking on Wikipedia). That means the main spot to inhabit, if any, would be near the division of light and dark.
Two planets tidally locked with each other, orbiting a single star. The days do end up being the same as their orbital period, but that's only going to be 6-8 days bc they're orbiting in such close proximity.
There's a lot of other fun effects of this, like very frequent eclipses and the other planet going through phases daily on one side of the planet while the other side has no direct interaction and feels much more like our planet.
Woah that sounds a lot more complicated to explore! Best of luck with it 🙂