Data Services
Rise/Set/Transit/Twilight Data
- Complete Sun and Moon Data for One Day
- Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year
- Rise/Set/Transit Times for Major Solar System Objects and Bright Stars
- Duration of Daylight/Darkness Table for One Year
Phases of the Moon
Eclipses and Transits
- USNO Eclipse Portal
Maps, global circumstances, local circumstances, and animations for all solar and lunar eclipses from 1501 to 2100 inclusive. - Eclipses of the Sun and Moon
Eclipse Visibility Maps from The Astronomical Almanac (PDF). - 2017 August 21 Total Solar Eclipse
Resource center for the 2017 eclipse crossing the continental United States. - 2024 April 8 Total Solar Eclipse
Resource center for the 2024 eclipse crossing the continental United States. - Solar Eclipse Computer
Computes circumstances for selected solar eclipses at any given location. - Lunar Eclipse Computer
Computes circumstances for selected lunar eclipses at any given location. - Recent and Upcoming Transits of Mercury and Venus
- Transit Computer
Computes circumstances for selected transits of Mercury and Venus at any given location.
Positions of Selected Celestial Objects
- Altitude and Azimuth of the Sun or Moon During One Day
- Topocentric Configuration of Major Solar System Bodies
Provides tables of low precision topocentric position data for the Sun, Moon, and major planets. - Geocentric Positions of Major Solar System Objects and Bright Stars
Provides high precision geocentric position data for the Sun, Moon, major planets and selected bright stars. - Topocentric Positions of Major Solar System Objects and Bright Stars
Provides high precision topocentric position data for the Sun, Moon, major planets and selected bright stars.
Synthetic Views of the Earth and Solar System Bodies
- What Earth Looks Like Now
- Day and Night Across the Earth
Creates synthetic views of the Earth's surface for any date and time. - 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
- Julian Date Conversion
- Sidereal Time
Celestial Navigation
- Celestial Navigation Data
Provides computed altitudes and azimuths and other data for an assumed position and time. - Navigational Star Chart