Environmental historians and archaeologists have released a joint study revealing how the African Humid Period—a time when the Sahara was a lush grassland—directly influenced the construction of complex stone solar calendars. Data gathered from the Nabta Playa region suggests that ancient pastoralists developed advanced astronomical knowledge to predict the onset of monsoon rains essential for their cattle.
By analyzing pollen cores and sediment layers, the team demonstrated that the abandonment of these sites coincided exactly with a rapid desiccation event 5,000 years ago. This research provides a new 'climate-first' perspective on how environmental fluctuations forced early civilizations to innovate technologically, specifically in the realm of timekeeping and seasonal navigation.