English trivia (sorry, jordy): "a" is to "an" as "thy" is to "thine". That is, "thy" comes before a consonant, and "thine" comes before a vowel. "Thy seeds", "thine acorns".
@noelle It’s funny because I was just wondering what the difference was
@noelle
Consider the similarities:
Thine/mine
Thy/my
Thee/mee
Thou/mou
@noelle
The sequel:
Thou/you
Thee/yee
Thine/yine
Thy/yy