Why is Twilight the book called Twilight?

This is a quote from Stephenie Meyer's official website on her reasons for naming the first installment in the Twilight Saga "Twilight":

"Twilight was not the easiest book to title. When I started sending out queries, I called it Forks for lack of a better idea. The first thing my agent advised me was that the title was going to have to change. We played around with a lot of different titles, and nothing seemed to convey the right feel. We brainstormed through emails for about a week. The Word twilight was on a list of "Words with atmosphere" that I sent her. Though these Words were meant to be used in combination with something else, the Word twilight stood out to both of us. We decided to try it out, and, after a little adjustment time, it started to work for both of us. It isn't absolutely perfect; to be honest, I don't think there is a perfect title for this book (or if there is, I've never heard it). When I look at the titles other countries have used (examples: Germany: Bis zum Morgengrauen which is "Until Dawn" or "Bite" if you add an "s" to make it "biss" (if you look at the German book cover on the Twilight International page); Finland: "Temptation;"France: "Fascination;" and Japan, which has split it into three separate books: "The Boy Whom I Love is a Vampire," "Blood Tastes Sadness," and "The Vampire Family in the Darkness."), it seems like I might be right about that. (BothNew Moon and Eclipse were much easier to title, and the titles also fit better.)"

This quote is available on her website via the related links section below.