John Hadley

John Hadley was an 18th-century English mathematician and inventor who is best known for developing early methods of creating and manipulating geometric tools, such as the octant—a navigational instrument that helped sailors determine their position at sea. His work significantly contributed to advancements in navigation and mathematics. Hadley's innovations made it easier to measure angles and distances, which improved the accuracy of sea voyages during his time. His contributions are considered crucial in the development of modern navigation techniques, and his work laid the groundwork for future technological improvements in maritime exploration.