Threadfall questions

[Amanda N]

Okay, so these might be really stupid questions, but please forgive me.

How is the threadfall schedule determined?  I mean, how do they know when and where it's going to fall?  Were records kept?  Or something else?

[Cali]

In Dragonflight F'lar talks about how he'd gone over all the old records marking where threadfall fell and when and he discovered a predictable pattern and made a timetable.  That's what they went off of in the 9th pass.  If those timetables still exsist who knows, but it's probably something similar.

[Eimi]

Yes, they probably had the ancient records of Threadfall even if they didn't believe they'd be used.  They'd have been a curiosity than anything.  They probably used both that and the last fours turns of experience, along with Starsmith's observations of the Red Planet, in order to make the current charts.