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The counter on the main page is not just a counter. The background image changes very slowly.. at a believed rate of around one frame every 6 hours. We know that the puzzle needs to be solved before the countdown ends. Here is a link that shows most of the frames until now:
It is an Orrery with what looks like a musical score, some language that looks mixed, but definitely looks like parts of greek, and other hidden things. They are breaking it down on the following thread.
So this post on the main forum explains most of it: