Posted by: anton1792
Well, I don't think the days would be any longer than ours. If a planet rotates too slowly, then I think one side gets baked by the sun due to the long exposure times, whilst the other side plummets. Think about how hot it gets in the hours between midnight and 3pm on a summers day, and then double that for 42 hour days, etc. Same with freezing conditions.
As for Sanghelios' position in that pic, would it not be more likely that the planets orbit outside the binary group's orbit? If Sanghelios was slap bang in the middle, then that is a lot of solar energy it would be getting, especially when passing between the two star groups. I think they would have to be quite far from their centre sun, both for long term stability of their orbits and habitability, though I am no expert.
There was a post on Halopedia about this. Urs is described as being a primary, so like that guy says, Sanghelios probably orbits Urs at either a distance along with the other two (That are a close Binary) or the close Binary are at the center and Sanghelios tags along with Urs as it orbits the Binary.
You're probably right about the day/night cycle. It seems right totally. I've made some calulations (cool word for drawing some -blam!- :P), and I came to the conclusion that half the time of the year, both suns are up at different times (in fact, sometimes even with no night at all). But there's also the opposite way, with total night almost 40% of the time, which comes with all three suns shining on the surface the whole day. Anyway, I haven't included the possibility of a tilted axis and that Urs rotates Fied and Joori, or vice versa.
Quoted from the halopedia articles about Fied:
Fied is one of three stars in the ternary Urs system. It orbits the primary star Urs along with the star Joori and at least four planets, which include the Sangheili homeworld Sanghelios.
It might just be my weird way of reading or some -blam!-, but to me, it seems like that this line suggests that Fied orbits Urs together with Joori with the four planets, but it can't be true, as it would be too unstable to orbit them.
The three stars could also share a center of mass somewhere inbetween them, but that doesn't really seem stable for any planets rotating Urs, so i trashed that one. To me, it seems more likely for Fied and Joori to be the center stars. I might be wrong, as there's real examples that support both theories. I checked my writings again if the different theories affected it, and they don't, feeding my happiness =D (it took an hour to make them). I also have to check on the moons and double check any information on the time of the orbits.
Anyway, thanks a lot for your answer, it helped me a lot.