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Hello all. This is, I guess, the second leg of my quest to create a Cosmere world in D&D. Now, for reasons of my own understanding (namely, "because I think its cool") I want my primary world to have a year longer than its day. Not tidally locked a la Taldain, but definitely long enough for the change from day to night, or from night to day, to be a momentous occasion, possibly comprising several days. However, and here's the rub, I also want this world to be livable by humans. I've got a couple questions with regard to how such a system would be laid out, and if there would be other planets involved. Note that all of these questions are coming from a layman's perspective. What color is the star? Obviously making it too bright means that the habitable zone is farther out, and that means a longer distance that the planet needs to travel before it completes a full rotation. Conversely, making it too dim pushes the habitable zone close enough to the sun that solar weather starts to become an issue, and I'd rather avoid that particular headache. How large/dense is the planet? Once we've determined the size and color of the star, we can then start looking into how large a planet needs to be to settle into the resultant habitable zone. Too small and it flies out of the habitable zone in one direction, too large and it flies out in the other direction. Is there anything about the planet that would regulate temperatures? Venus' scorching temperatures are mostly due to its thick cloud cover, so instituting such a dense atmosphere could be useful in making it play nicely with life. These clouds could be Invested or not, as this is so early in the creation process that basically everything is in flux. How many moons? At least one moon will be necessary for several reasons (ease of timekeeping for the players chief among them, although I currently have it playing a role in the behind-the-scenes of the story). Are there any other planets in the system? As this is a D&D world, I'm currently assuming that the outer planes are locations within the Cognitive Realm. Which means at least two other planets (for the Hells and Heavens respectively) and between 4 (the elemental planes) and 6 (the elemental planes +plus Feywild and Shadowfell) others exist somewhere within hiking distance of the Prime Material's subastral. These other planets (assuming we pack them all into one solar system, which seems a stretch) might have effects in the Physical as well, especially with regard to the stats of the star we agree upon. Is there some math formulae we can use for all of this? It would help immensely if we could just define a variable or two, plug them in, and go.