How I wish this didn't end so quickly; pretty kool man; I have to say. Very interesting concept; though if we were to get scientific, I doubt this theory would hold water. But for the simple fact that this is fiction, it can be watever you want it to be, and as such; excellent theory. Very intriguing, keep writing.

Hey, I like this...Looks like it could get really interesting. I'm a huge fan of time travel...can't wait to read more!

the problem with that theory, sorry to say, is that while the earth rotates, it also revolves around the sun, in other words, moves from the spot it was in. and while the sun seems as if it's standing still, it's moving too, along with the galaxy's rotation. So going back in time means going back in space. Think about it. Kind of problematic, isn't it?

Wow... I really like this. Those're deep thoughts you have. Very very interesting theory... =) I really like how you explained it too, using the conversation of a teacher and a student (or so I'm assuming). =)