astronomy freeware


Celestia – added 1/19/2009

Celestia is an astronomy software program that renders a simulation of the entire universe, based on currently known astronomical information. It includes beautifully rendered planets, moons, and some smaller orbital bodies such as Mir and the International Space Station. Celestia is not limited to our solar system; you can visit other stars, or even travel outside the galaxy.


Home Planet – added 11/30/2007

Home Planet is a comprehensive astronomy, space, and satellite-tracking package which puts a somewhat different spin on the usual astronomical or planetarium program. Home Planet places the Earth in its place in the universe, allowing one to look up toward the stars or down upon the Earth from a variety of perspectives.


CorCor – added 6/4/2005

CorCor determines the correction of equatorial coordinates-apparent place of a star.


Deep Sky And Double Star Database – added 6/4/2005

Access database containing the Saguaro Astronomy Club Double Star and Deep Sky Database with more than 10000 objects each. The database features extensive sort and filtering functionality. It has a new reporting function allowing you to make custom deep sky reports setting your own filter criteria like: magnitude, one or more constellations, one or more object types, declination range, favorable placing near the meridian at 00:00hrs local time at the first of the month or any combination of these.


Resolution – added 6/4/2005

Calculates the focal plane image diameter of an object given its angular size in arcseconds and the focal length of the telescope. Resolution can also calculate either arcseconds, distance or separation given two out of three parameters.


Moovastar – added 6/4/2005

Using the Bright Star Catalogue and the proper motion of the stars the program simulates star positions in the future and past. The Bright Star Catalogue contains stars up to magnitude 6.5. You can choose a region of the sky, set the limiting magnitude and set a time sequence (time step, number of steps, and step interval). The program will simulate the motion of the stars. There’s a clear help function included.


Meridian – added 6/4/2005

Meridian can be used by amateur astronomers. It lets you consult information on the observation of the solar system: Sun, Moon and planets. The data is given with text and graphics. Meridian is very useful to plan or verify the observations of planetary surfaces and of natural satellites for some planets. Meridian is very user-friendly; the windows presenting planets are sizable. You can see the same object at different dates/hours, print the content of window, list the lunar phases for the current month and many other useful information.


GraphDark – added 6/4/2005

GraphDark is a program which allows you to work out when an astronomical object will be visible from your location and when moonlight, twilight or low haze will affect the view. The visibility of a single object, such as a comet, can be shown over a period of months or years. Alternatively a number of objects on a single night can be displayed.


Distant Suns – added 6/4/2005

Distant Suns is one of the premier desktop astronomy packages of all time. For both casual skywatchers to seasoned amateur astronomers, Distant Suns will take you from your home to the outer reaches of the Universe and back. Distant Suns is compatible with Windows 95,98, ME, NT, 2000, and XP. With Distant Suns you may view the sky at the time of your birth, watch the sun set behind Saturn, land on Mars and follow newly discovered comets. (there is a free version of this program on a “register” page in the link above.)


Helio – added 6/4/2005

Determines the solar position (RA, Dec, altitude and azimuth) and solar parameters (Bo, Lo, P, apparent diameter and Carrington rotation of the central meridian) for a given date and time, and observer latitude and longitude, and select the orientation of the solar disk. (down the page)


Distant Suns – added 6/4/2005

Distant Suns is one of the premier desktop astronomy packages of all time. For both casual skywatchers to seasoned amateur astronomers, Distant Suns will take you from your home to the outer reaches of the Universe and back. Distant Suns is compatible with Windows 95,98, ME, NT, 2000, and XP. With Distant Suns you may view the sky at the time of your birth, watch the sun set behind Saturn, land on Mars and follow newly discovered comets. (there is a free version of this program on a “register” page in the link above.)


StarCalc – added 6/4/2005

StarCalc is the fastest professional astronomy planetarium & star mapping program for Windows 9x/ME/NT/2000/XP. It illustrates star positions of any instance of the day observed from any geographic locations on the Earth. The star positions can be viewed and presented as images of hemispherical whole sky or any of the user defined sub-areas. These images can be zoomed at different scales, rotated, screen-captured and printed. Also, StarCalc has many other functions of calculation and showing of sky objects.


Celestia – added 5/31/2005

The space simulation that lets you explore our universe in three dimensions. Unlike most planetarium software, Celestia doesn’t confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy. All movement in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A ‘point-and-goto’ interface makes it simple to navigate through the universe to the object you want to visit.


Planetary Apprentice – added 6/4/2005

Planetary Apprentice is a reference tool that displays several properties for a selected planet. There are 18 properties divided into four categories – orbital, physical, axial, and atmospheric. The Apprentice shows all 18 properties for your seleceted planet in one scrollable window.


Cool – added 6/4/2005

Cool models the effects of different thermal situations, and demonstrates how forcing airflow over the primary mirror of a Newtonian reflector dramtically improves performance.


Binoplan – added 6/4/2005

Binoplan that calculates the spacing of the various optical elements and shows on-axis and off-axis vignetting and emulates a pair of right-angle, correct-view binoculars.


Mars Previewer II – added 6/4/2005

Mars Previewer II is a very handy utility for Mars watchers. It displays the central meridian and angular size of the red planet for any date and time — on the algorithm used in MARS.BAS (in the S&T Basic Programs listings).


Project AstroFly – added 6/4/2005

AstroFly is a software project, which is intended for educational use; thus, if you are interested in astrophysics, it may help you to expand your knowledge about our Universe. Its main purpose is to present the three-dimensional models of our neighborhood in our own Milky Way Galaxy on a personal computer. The 3D models are based on the remarkable Hipparcos and Tycho Catalogues, which are the products of the European Space Agency’s Hipparcos Space Astrometry Mission.


Sec – added 6/4/2005

Sec finds the optimum size of a Newtonian’s secondary mirror.


V. M. A. – Virtual Moon Atlas – added 6/4/2005

Software for Moon observation and survey. Let you visualize the real Moon aspect at every time. Also help to study any lunar formations using feature database and pictures library.


Moonphase – added 6/4/2005

Moonphase displays the current moon phase of current day as an icon in the Activity field. Open the program from the Activity field if you want to know the moon phase for an optional day.


VAROBS: Variable Stars Observer – added 6/4/2005

Variable Stars Observer helps you to plan and log variable stars observations.


Suncycle – added 6/4/2005

Suncycle is a calendar showing the sunrise and sunset time for a latitude/longitude and timezone You can also configurate in the aboutscreen the winter and summer time offset. On the sunrise/set a mediafile can be activated (image and sound).


Xearth – added 1/18/2006

Xearth for Windows is a port of Kirk Johnson’s original xearth program to Microsoft Windows. Xearth renders a shaded image of the earth on your desktop, as seen from your favorite vantage point in space. By default, the image is updated every five minutes according to the current position of the sun.


Orbiter – added 12/6/2005

Orbiter is a free flight simulator that goes beyond the confines of Earth’s atmosphere. Launch the Space Shuttle from Kennedy Space Center to deploy a satellite, rendezvous with the International Space Station or take the futuristic Delta-glider for a tour through the solar system – the choice is yours. But make no mistake – Orbiter is not a space shooter. The emphasis is firmly on realism, and the learning curve can be steep. Be prepared to invest some time and effort to brush up on your orbital mechanics background.


IRIS – added 4/1/2005

An astronomical images processing software. Iris is a software written for run under Windows95/98/NT/XP. It offers numerous and powerful functions of image processing in the field of the digital astronomical images. Iris is particularly optimized to exploit the images that come from CCD cameras. Iris can load and save images in the formats FITS, PIC (proprietary format), raw or BMP. Iris can read also the images of the Buil-Thouvenot Atlas, a CD-ROM which contains 4649 images of 6600 objects of the deep-sky.


Planetarium – added 5/1/2005

Create visuals of the solar system, constellations, moonphases, stars, planets from the time of Galileo until now.


SolarInfo – Solar System Information – added 5/14/2005


An application that shows some information about the planets and their moons in our solar system. The images are all from real photos. You can use your mouse to manipulate the planet and rotate it in any direction.


Orbiter Space Flight Simulator – added 6/4/2005

Orbiter is a flight simulator that goes beyond the confines of Earth’s atmosphere. Launch the Space Shuttle from Kennedy Space Center to deploy a satellite, rendezvous with the International Space Station or take the futuristic Delta-glider for a tour through the solar system – the choice is yours.


SkyNotes – added 12/7/2004

Designed to manage your Astronomy Observation notes. Collect your location, details, notes, and actual pictures from your telescope’s camera.


SkyGazer Ephemeris – added 12/7/2004

Get the ephemeris for the Moon, any planet at any location on earth at any time past or future.


TeleCalc – added 6/4/2005

Shows you all the calculations of your telescope.


The Aberrator – added 6/4/2005

The Aberrator generates star-testing images to show the effects of aberrations(distortions) influencing the quality of a telescopes performance.


Avis (Astro-vis) – added 6/4/2005

Avis (Astro-vis) is a FITS viewer for Windows 95, 98, 2000 and XP. FITS files are used in scientific applications like astronomy and medical imaging.


Hr Trace – added 6/4/2005

Hr Trace allows you to study galactic open clusters with some Excel + Visual Basic for application programmed spreadsheets.


RegiStax – added 6/4/2005

Image processing software to process BMP or Multiple AVI image sequences.


Stellarium – added 6/4/2005

Stellarium is a GPL software which renders realistic skies in real time with openGL. It is available for Linux/Unix, Windows and MacOSX. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.


NexStar Observer List – added 6/4/2005

(NSOL) is a PC control program for all models of Celestron NexStar, CGE, Advanced Series GoTo (AS-GT) and Ultima 2000 scopes, as well
as the Tasco StarGuide scopes.


Planetary, Lunar, and Stellar Visibility – added 6/4/2005

Planetary, Lunar, and Stellar Visibility (successor to Planet’s Visibility 2.0) presents a 3-color diagram that shows when a planet, a star, the moon or the sun is visible during any year from 3000 BC to AD 6000 at any location on the earth.


Alcyone Ephemeris – added 6/4/2005

Alcyone Ephemeris is an accurate and fast astronomical ephemeris calculator covering the period 3000 BC to AD 3500. Click on screenshot to enlarge. It calculates heliocentric, geocentric, and topocentric positions of the Sun (Earth), Moon, and planets in ecliptical, equatorial, and horizontal coordinates, with optional corrections for parallax and refraction; rectangular coordinates, velocity, acceleration, apparent diameter, magnitude, phase, lunar libration, orbital elements, differences for all of these, and more.


PP3 – added 6/4/2005

PP3 creates celestial charts. It generates resolution independent maps of very high graphical quality. They can be used for example as illustrations in books or on web pages. You may use own databases or ones from the Internet.


Cartes du Ciel – Sky Charts – added 5/29/2005

This program enables you to draw sky charts, making use of the data in 16 catalogs of stars and nebulae. In addition the position of planets, asteroids and comets are shown. The purpose of this program is to prepare different sky maps for a particular observation. A large number of parameters permit you to choose specifically or automatically which catalogs to use, the colour and dimension of stars and nebulae, the representation of planets, the display of labels and coordinate grids, the superimposition of pictures, the condition of visibility and more.