Data
Services
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Time and Date.com
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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
Dates of Primary Phases of the Moon
Fraction of the Moon Illuminated
What
the Moon Looks Like Today
Eclipses
and Transits
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
Day
and Night Across the Earth
Creates synthetic views of the Earth's surface (in grayscale or color)
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 2000-2020
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
Astronomical Almanac Online
Provides complementary data to the printed Astronomical
Almanac.
International Celestial Reference System (ICRS) - Important links relating to the implementation of the ICRS
Occultations of Stars by Asteroids
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Glossary of Terms
Astronomical
Almanac Online Glossary
Phenomena of the Sun and Moon
Rise, Set, and Twilight Definitions
Lengths of Longest and Shortest Days
Length of Day and Night at the Equinoxes
Visibility of the Crescent Moon
Phases
of the Moon and Percent of the Moon Illuminated
Time
Universal Time and Greenwich Mean Time
Computing Greenwich Apparent Sidereal Time
When
Does Daylight Time Begin and End?
Calendars and Historical Events
The 21st Century and the 3rd Millennium
The
First Sunrise of the New Millennium
Computing Astronomical Data and Phenomena
Converting Between Julian Dates and Gregorian Calendar Dates
Computing Times of Rise and Set
Computing Greenwich Apparent Sidereal Time
Computing
Altitude and Azimuth
Other Topics
Astronomical Data Used for Litigation
Celestial Navigation Resources
The Seasons and the Earth's Orbit
International Celestial Reference System (ICRS)
When Did the Asteroids Become Minor Planets?
Masses of the Largest Asteroids
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JAVA Applets
Juergen Giesen's