The American Nautical Almanac

The American Nautical Almanac is a reference publication that provides detailed astronomical data essential for navigation and celestial observations. It includes information on the positions of the Sun, Moon, planets, and stars, as well as tides, sunrise, and sunset times. Mariners, navigators, and astronomers use it to determine their geographic location and time by observing celestial bodies. Published annually by the U.S. Naval Observatory, it ensures accurate navigation at sea and supports scientific research by providing precise celestial data aligned with the Earth's movements.