The Royal Observatory Greenwich

The Royal Observatory Greenwich, established in 1675 in London, is renowned for its historical role in astronomy and navigation. It is best known for the Prime Meridian, the line that defines zero degrees longitude, which is fundamental for timekeeping and global mapping. The observatory played a crucial part in the development of precise time measurement, using a famous timekeeping device called the marine chronometer. Today, it houses a museum showcasing astronomy, timekeeping, and navigation history, and visitors can stand on the Prime Meridian line, making it a significant cultural and scientific landmark.