The speed of light is one of the most fundamental constants in the universe, shaping our understanding of physics, astronomy, and the nature of reality itself. The journey to determine the speed of light is a fascinating tale of human curiosity, ingenuity, and perseverance, involving numerous scientists across centuries. In this detailed exploration, we'll cover the significant milestones in the history of measuring the speed of light, from ancient speculations to modern precise measurements, and highlight contributions from around the world, including notable Indian contributions. Ancient and Medieval Speculations The nature and speed of light have intrigued humans for millennia. Ancient civilizations, including the Greeks and Indians, speculated about the properties of light, but without the tools and methods to measure its speed. Greek Philosophers : The Greeks had diverse opinions on light. Empedocles (5th century BCE) proposed that light traveled and had a finite speed. Aris...