If you want to hear a Zelda fan talk for hours and hours about something nobody gives a crap about, bring up the idea of a Zelda timeline. There is so much debate as to whether all the Legend of Zelda games exist in the same universe that you'd be dead before you read it all.
That said, Skyward Sword producer Eiji Aonuma has actually come out to definitively say that a timeline exists. Wait a minute ... hasn't Nintendo repeatedly denied that one exists?
"Yes there is a master timeline but its confidential document," the producer tells Official Nintendo Magazine. "The only people to have access to that document are myself, Mr. Miyamoto and the director of the title. We can't share it with anyone else!
"I have already talked to Mr. Miyamoto about this so I am comfortable in releasing this information -- this title [Skyward Sword] takes place before Ocarina of Time. If I said that a certain title was ‘the first Zelda game’, then that means that we can't ever make a title that takes place before that! So for us to add titles to the series, we have to have a way of putting the titles before or after each other."
Well, that was nice and vague. Still, the debate has finally been lain to rest. The Legend of Zelda has a timeline ... at least until the next Nintendo executive comes along to say that it doesn't!
Skyward Sword Before Ocarina of Time in Zelda Timeline [Zelda Dungeon]