Data Services

Sunrise, Sunset, Moonrise, Moonset, and Twilight

		Complete Sun and Moon Data for One Day
		Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year

Moon Illumination

		Phases of the Moon
		Fraction of the Moon Illuminated

Eclipses

		Recent and Upcoming Eclipses of the Sun and Moon
		Lunar Eclipse Computer

Positions of the Sun and Moon

		Altitude and Azimuth of the Sun or Moon During One Day
		Position of the Sun at Noon for Washington, D.C.

Data for Solar System Bodies and Bright Stars

		Web Version of MICA - Multi-Year Interactive Computer Almanac includes positions, rise/set/transit, physical ephemerides - plus sidereal time & Julian dates
		Orbital Elements of Asteroids provides an online interface to a database of orbital elements and other properites of known solar system small bodies (NEOs, main-belt asteroids, Centaurs, trans-Neptunian objects, but not comets)
		Apparent Disk of Solar System Object creates a synthetic image of the telescopic appearance of the Moon or other solar system object for specified date and time

Dates

		Earth's Seasons - Equinoxes, Solstices, Perihelion,and Aphelion 1992-2005
		Spring Phenomena, 25 BCE to 38 CE
		Date of Easter
		Julian Date Conversion

Celestial Navigation

		Celestial Navigation Data provides computed altitudes and azimuths and other data for an assumed position and time
		Navigational Star Chart

Miscellaneous

		International Celestial Reference System (ICRS) - Important Links
		Occultations of Stars by Asteroids (International Occultation Timing Association)
		Transit of Mercury - 2003 May 7   General description and geocentric data (PDF)   World map of visibility (PDF)   List of ingress/egress times for major world cities (PDF)
		Transit of Venus - 2004 June 8   General description, geocentric data and list of ingress/egress times for major world cities (PDF)   World map of visibility (PDF)
		Eclipses/Occultations of the Galilean Satellites 2002 - 2003

DoD Information

DoD Information (restricted access)