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Greenwich Observatory is a historic astronomical observatory located in Greenwich, London, United Kingdom. It is operated by the University of Cambridge and is one of the world's most famous observatories. The site has a long history, with the first building erected in 1675 by King Charles II as the Royal Observatory. It was designed to allow for the determination of longitude at sea, a problem that had plagued navigation for centuries.

The prime meridian, 0 degrees longitude, passes through Greenwich Observatory. This is the basis for the Global Positioning System (GPS) and is used as the reference point for time zones worldwide. The observatory is also home to the Royal Greenwich Observatory, which is responsible for timekeeping and the dissemination of accurate time signals to the world.

Greenwich Observatory is open to the public and offers guided tours. It houses a collection of historic telescopes and instruments, including the Airy Transit Circle, the largest transit instrument in the world. The observatory also hosts various events and exhibitions throughout the year, including stargazing sessions and lectures on astronomy.

The site is a UNESCO World Heritage Site, recognizing its significance in the history of astronomy and navigation. It is also a Grade I listed building, reflecting its architectural and historical importance. Greenwich Observatory continues to be a center for astronomical research and education, contributing to our understanding of the universe and the advancement of scientific knowledge.