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| U.S. Naval Observatory | Astronomical Applications Department |
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Data Services |
Sunrise, Sunset, Moonrise, Moonset, and Twilight
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Complete Sun and Moon Data for One Day | |
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Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year |
Phases of the Moon
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Dates of Primary Phases of the Moon | |
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Fraction of the Moon Illuminated | |
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What the Moon Looks Like Today |
Eclipses and Transits
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Recent and Upcoming Eclipses of the Sun and Moon | |
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Lunar Eclipse Computer computes circumstances
for selected lunar eclipses at any given location |
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Recent and Upcoming Transits of Mercury and Venus | |
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Transit of Venus Computer computes circumstances
for the June 8, 2004 transit of Venus at any given location |
Positions of the Sun and Moon
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Altitude and Azimuth of the Sun or Moon During One Day | |
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Position of the Sun at Noon for Washington, D.C. | |
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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
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Web Version of MICA - Multi-Year Interactive Computer Almanac includes positions, rise/set/transit,
physical ephemerides - plus sidereal time & Julian dates |
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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) |
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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
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Earth's Seasons - Equinoxes, Solstices, Perihelion,and Aphelion 1992-2020 | |
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Spring Phenomena, 25 BCE to 38 CE | |
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Julian Date Conversion |
Celestial Navigation
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Celestial Navigation Data provides computed altitudes and azimuths
and other data for an assumed position and time |
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Navigational Star Chart |
Miscellaneous
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International Celestial Reference System (ICRS) - Important Links | |
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Occultations of Stars by Asteroids (International Occultation Timing Association) | |
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Eclipses/Occultations of the Galilean Satellites 2002 - 2003 |
DoD Information
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DoD Information (restricted access) |