I'd have thought it would be somewhere, but I've found nothing and Search only brought up a few results for the whole forum (so, maybe it's an ancient thread?) but is there somewhere to find how the dates line-up with Birthsigns?

I'm assuming here Birthsigns work like real-life Zodiac, but basically I'm wondering how they're worked out in-universe...

Thanks for any info

http://www.uesp.net/wiki/Lore:Calendar

Scroll down a bit. Each month has a sign, except for the Serpent of course.