Istwa Nou

Three hundred kilometres southwest of Aswan, in country that is now open desert, there was a lake that filled in the rains. By the middle of the fifth millennium BCE the people who watered cattle there had turned the place into a ritual centre. They erected megalithic arrays, including a circle of stones that works as a calendar and five separate alignments, each pointed at the rising position of a particular star. Every material indication at Nabta Playa and across the wider region says the builders were Nilo-Saharan speakers, the same livestock-raising communities whose pottery and burial customs were moving north down the Nile. The date is the point. The Great Pyramid at Giza went up a full thousand years after these stones were set. The astronomy that later gets described as an achievement of the Egyptian priesthood was already being practised by African pastoralists in the desert, who read the sky closely enough to fix its motions in stone.