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
- Eclipses of the Sun and Moon
- 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
Celestial Navigation
- Celestial Navigation Data
Provides computed altitudes and azimuths and other data for an assumed position and time. - Navigational Star Chart