Lets be honest, there's obviously other intelligent life in the universe. There's probably tons of it, I don't think it's ever visited earth before, and we'll likely never shake its hand, but its out there. One day we can hopefully communicate with one, it would have to be done with radio signals over generations, but it would be amazing to see it happen.
I've always thought it more likely than the fact that intelligent civilizations destroy themselves is the fact that intelligent civilizations are out there and the really smart ones actually know the Earth exists. Interstellar distance is likely a problem that no one has truly solved but I like to think there's civilization out there that knows the Earth exists and is ripe for life, just they're too far away to do anything about it.
I'm as big an astronomy geek as anyone else, but this is so pointless. Why bother wasting time and effort with this? Just let the discrepancies accumulate and adjust 6 seconds every 10 years or so. It would save everyone a little bit of effort, and you could make an event out of it.
Your slider slides too quickly, it doesn't give readers time to actually look at the images.
Also, there should be a way to preview your service without having to sign up. You're going to lose users by forcing a sign up without being able to see the product.