Nautical time refers to timekeeping used by sailors, which is based on the position of the sun and stars in the sky. Some synonyms for nautical time include celestial time, maritime time, and sailor's time. Celestial time is used to describe the navigation using the position of stars and other celestial bodies. Maritime time is a more general term and can refer to anything related to the sea, including tracking ships and measuring ocean currents. Sailor's time specifically refers to the unique way sailors think about time, which is often based on the changing weather conditions and their specific roles on a ship. Regardless of the term used, nautical time is crucial for safe navigation on the open seas.