Astronomical Data from the U.S. Naval Observatory
"The Astronomical Applications Department of the U.S. Naval Observatory computes, from fundamental astronomical reference data, the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena." The Astronomical Information Center section of this site provides "astronomical data, mainly in tabular form, for use in navigation, surveying, scientific research, litigation, accident reconstruction, and many other activities. Issued annually, the almanacs contain data for one year." The Data Services section of this site provides information of the phases of the moon, eclipses and transits, positions of selected celestial objects, and tables of sunrises/sunsets, etc.