Yes, but eternal night would have resulted in genocide due to everyone dying of cold and famine.
Axios!
@ Librarian: I'd think Earth Pony innate magic can make it so that plants can grow by moonlight.
Tealove is best pony.
Pony Fanon Index
I basically agree with Badwolf (though I of course, think Celestia's more powerful) and I think of Cadance as less of being the reincarnation and more as having taken the role of alicorn of Venus. Not all of them were as nice as she is.
Unity of the Sun Mare
@Ace: That's how I see it. In fact, I actually think she took the position over from Chryslis, who was previously corrupted and so couldn't fill the role anymore.
@ Bad: Noooo, Word of Faust said that every pony would have died.
Axios!

Celestia actually controls the rotation of the planet, while Luna controls the orbit of the moon

There is air in space around the Equestrian planet, which is why they can't just start those up and forget about it.
I have a message from another time...
Doctor Hoofenshmirtz: "Behold, the Treeinator! You see, when I was a little foal, I had always wanted to join the school play. So I signed up for the auditions, and eventually they gave me a part... as the tree. People kept laughing at me even after the play was over because I looked so silly in a tree costume. I can't even go to my school reunion because people still remember me as the tree. So now, with my Treeinator, I'm going to turn everyone in the entire Ponyville area into trees!"
(a scene or two later...)
Fluttershy: *leafing the dream*
Life is simple: it has no nontrivial normal subgroups.
I like to imagine that there is an underground cabal of cultist nobles who plan to create their own Princess Alicorn through forbidden blood eugenics.
@Librarian: You could always go to the Exiles Forum Turtle set up to vent.