The United Kingdom Hydrographic Office

Welcome

HMNAO is a small multi-disciplinary group of specialists whose purpose is to provide solutions to astronomical and celestial navigation problems. The Office produces astronomical data suitable for a wide range of users, including professional and amateur astronomers, mariners, aviators, surveyors, the Armed Forces, the Police, lawyers, religious groups, architects, schools, diary and calendar manufacturers, photographers and film crews. In fact, anyone requiring astronomical information may have need of our services.