 The tallest stone casts a shadow on the calendar stone and that shadow moves across the calendar stone 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,