We agree unanimously that Trelwaney made the prophecy b/w Winter 1979 and Spring 1980. I'm writing a fic in period July 1980 to September 1980. Who knew of the prophecy apart from Dumbledore, James, Lily, Alice and Frank?
Do you think Sirius knew? How about Augusta?
And when do you think, Snape come to Dumbledore with the confirmation that it was Lily's son that Voldemort had chosen?