Approximate Astronomical Positions
   Astronomical calculations including coordinate conversion, position and circumstances of the Sun and Moon, the positions of the planets, and the times of sunrise, sunset, moonrise and moonset. Designed for applications where high accuracy is not needed.
   http://www.xylem.f2s.com/kepler/

AstroMB
   Advanced software for astrometry, photometry, robotic observations. Huge database of images and catalogs. Works with MaximDL and ASCOM. Free downloads.
   http://www.astromb.com

AstroTips - Astronomy Freeware and Shareware
   Information on selected astronomy free software. Read a comment, see a screenshot and download.
   http://www.stargazing.net/AstroTips

Astronomy Common Object Model (ASCOM)
   Promoting the use of open scriptable tools for amateur and educational astronomy.
   http://ascom-standards.org/

Astronomy Explorer
   A full-length academic approved course in astronomy on CD-ROM that studies the universe, stars, galaxies, quasi-stellar objects and blacks holes, and our Solar System.
   http://www.eoascientific.com/science_education_software/astronomy/astronomy_software.html

Astronomy Formulas
   Lunar and solar periodicity formulas, definitions, time formulas, notation, astronomical constants with computer code for a programmable HP 48 by James Q. Jacobs.
   http://www.jqjacobs.net/astro/astrofor.html

Astronomy Software Resources
   Discover links and resources for astronomy software for amateur and professional astronomers and for people interested in astronomy, stargazing and space.
   http://space.about.com/cs/software/

Astronomy-related software
   A list of many astronomy-related programs.
   http://www.open.hr/space/space/programs.htm

Cartes du Ciel / Sky Charts
   Freeware allowing one to draw charts according to the data of 15 catalogs of stars and nebulae, as well as the position of planets, asteroids, and comets. Available in English and is translated in 8 other languages.
   http://www.stargazing.net/astropc/

Computing planetary positions
   a tutorial with worked examples.
   http://hotel04.ausys.se/pausch/comp/tutorial.html

Deepsky 2000
   [commercial - Windows] Observation planning software for astronomers. Includes telescope control, logging, and charting.
   http://www.deepsky2000.net/

EVCODE
   A stellar evolution simulator designed for astronomy education.
   http://phastf.phys.uvic.ca/htbin/dir_html?evcode

Engineering, Science and Math Applications on Linux
   A large indexed collection of pointers to Linux applications.
   http://www.xnet.com/~blatura/linapp3.html#science

GeoClock
   [shareware MS-W] Sunlight clock with world times and sun and moon positions and coverage.
   http://www.geoclock.com/

Hubble Space Telescope -- Wallpaper
   [commercial - Win95/98/NT] Thirty full-screen Hubble photos for use as wallpaper and screen saver.
   http://www.screenthemes.com/packs/hubb001/showall.htm

Kairos General Calendar Conversion Program
   [commercial, demo available -- Win95/98/NT] Includes calendars required by historians of astronomy and general historians. Many details are provided for Indian and Jewish calendars and much besides. There is also a display of positions of the Sun, Moon an
   http://ourworld.compuserve.com/homepages/raymondm

Ksetiwatch
   Ksetiwatch monitors multiple SETI@home clients and automatically logs and manages completed work units.
   http://ksetiwatch.sourceforge.net

Linux for Astronomy cdrom
   [commercial - Linux] The new release of Linux for Astronomy includes over 3Gb of Astronomical software precompiled for the Linux (x86) operating system. Applications include a wealth of general purpose image and signal processing tools, as well as the sta
   http://www.randomfactory.com/lfa.html

LinuxAstro
   Astronomical software on Linux.
   http://bima.astro.umd.edu/nemo/linuxastro/

Lunar Calendars and Eclipse Finder
   Windows software for converting dates in various lunar and other calendars and for finding lunar phases and eclipses of various kinds.
   http://www.hermetic.ch/lcef/lcef.htm

Nightfall
   [open source - Linux/Unix] Interactive program for computing synthetic lightcurves and generating animated views and best-fit models of eclipsing binary stars.
   http://www.lsw.uni-heidelberg.de/~rwichman/Nightfall.html

Orrery
   Review of the solar system simulator (by Spacetech) for RISC OS workstations.
   http://www.harmsy.freeuk.com/orrer.html

RISC OS astronomy software links
   [commercial & freeware - RISC OS] Direct links to astronomy software available for RISC OS.
   http://www.harmsy.freeuk.com/resources.html#soft

Sky and Telescope -- Astronomical Software
   Links to the BASIC programs that appeared in Sky & Telescope, to shareware/freeware astronomy related software and to vendors of astronomy software.
   http://skyandtelescope.com/resources/software/

The Salopian Web
   Software links for astronomers professional, education and amateur. Planetaria, sky charts, and databases for PC, MAC and UNIX/LINUX platforms.
   http://www.r-clarke.org.uk/astrosoft.htm