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

Phases of the Moon

		Dates of Primary Phases of the Moon
		Fraction of the Moon Illuminated
		What the Moon Looks Like Today

Eclipses and Transits

		Recent and Upcoming Eclipses of the Sun and Moon
		Lunar Eclipse Computer
		Recent and Upcoming Transits of Mercury and Venus

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.
		Day and Night Across the Earth creates synthetic views of the Earth's surface (in grayscale or color) for any date and time

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 1992-2020
		Spring Phenomena, 25 BCE to 38 CE
		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)
		Eclipses/Occultations of the Galilean Satellites 2002 - 2003

DoD Information

DoD Information (restricted access)