Is there a way to predict the placement of the hardmode V?

So I always thought the seed determined where the hardmode V is going to appear, so I did a little experiment: I generated two worlds with the same seed, killed wof in one of them, marked out and copied the V onto the other world in hopes of cancelling it out, but it spawned somewhere else. So… Is there a way to predict the placement of the hardmode Vmore precisely?