Ancient Egypt's sundial tracked time with shadows

Around 1500 BC, ancient Egyptians invented the world's earliest known sundial, a simple yet ingenious device. This L-shaped bar, found in Pharaoh Amenhotep III's tomb, used a vertical gnomon to cast a shadow across marked lines, indicating approximate hours. It allowed Egyptians to divide daylight into 12 hours, organizing daily life, religious rituals, and farming tasks.