Trelawney was wrong,

[potioncat]

No: HPFGUIDX 121758


 
> Carol responds:
> Potioncat, you're taking this too seriously!

Potioncat:
Well, you would too if suddenly, in your mind's eye, you went from 
Rickman!Sape to Lord Farquand!Snape.

Carol:
I don't mean that
> Trelawney was describing Snape specifically. >
snip 
>  At any rate, I think she chose his birthday carefully. Saturnine 
disposition, anybody?
snip 
> Carol, who never intended this as a serious argument and does not
> believe in astrology but does think that poor Sibyl has powers 
she's not credited with if she only knew how to direct and interpret 
them

Potioncat:
Agreed. Capricorn (as Trelawney and another post descibed it) fits 
Snape and I think we should look closely at the goofy things 
Trelawney says because neither we or she knows when something will 
be correct!