What do the titles mean in the Twilight series?

in not sure about the 4th book but the other 3 all have the title somewhere in the book like, how (1st book) Edward is tell ing Bella about how twilight is the safest time of the day for him, and how it is the end of a day, but the start of a new one (I think) and in the 2 one, I'm not really remembering it.. but In the 3rd one Bella is tellign Jacob that he was her own personal sun and he used to level out the clouds, he told her the clouds he could deal with but and Eclipse he couldn't handle

also the names are pretty coool :)

erica

Twilight:

Because Twilight is the easiest, and also the saddest, time for vampires. Also, because it sounds cool. It was originally going to be called Forks, did you know that? It just doesn't have the same appeal, though, right?

New Moon:

I don't know, maybe because Edward has left, and Bella is facing a new part of her life, with Jacob instead of Edward.

Eclipse:

Because Edward is eclipsing Jacob, and also because of what Erica just said.

Breaking Dawn:

I'm really not sure. But I'm guessing that it's the start of an entirely new life for Bella.