of the U.S. Naval Observatory
Welcome to the web pages of the Astronomical Applications Department of the U.S. Naval Observatory . Our products -- almanacs, software, and web services -- provide precise astronomical data for practical applications, serving the defense, scientific, commercial, and civilian communities.
Data Services
Sun and Moon rise and set times, Moon phases, eclipses, seasons, positions of solar system objects, and other data.
Publications
Astronomical and navigational almanacs, special publications, and research reports.
About Us
Infomation about the department and its history.