 every six months from one edge to the other. So it starts on the summer solstice and then moves across, and it ends at the other edge of the calendar stone when you get to the winter solstice, and then it starts to move back. So we know it's a calendar, or at least those features have been built into it. But upon researching and studying it a lot more, we realized that that is just a built-in feature. It is actually a very powerful energy generating device itself.