Celestia is a free real-time space simulation that lets you experience 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 travel 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.

Distant Suns is one of the premier desktop astronomy packages of all time. Now in its 15th year of publication. Few other software packages can boast that kind of longevity. 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, XP and Macintosh. 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.

Highly recommended, try it out but it is a demo that has to be purchased. Detailed Earth Map High resolution map with shaded ocean depth shows outstanding 2km/pixel detail Weather Forecasts Weather conditions and 7 day forecasts for over 17,000 cities. Even add your own cities. Cloud Animations Display 3 days of clouds over the entire earth, updating every 3 hours. Webcams Hundreds of live webcams around the globe updating regularly. Add your own cam links to share with all. Much More... Volcanoes, live earthquakes, tectonic plate boundaries, countries and states are just some of the many details available in EarthBrowser.

The Burden of Time is a free ware program designed with two purposes in mind The main screen is a straightforward Maya calendar converter that translates Classical Maya long counts into the Western calendar and vise versa. It is simple, but pretty, with lots of graphics. From the main screen, an "Epigrapher''s Tools" option can be put into action. This part of the program isn''t as nice to look at, but includes a host of utilities for serious students and epigraphers. Features of the Burden of Time Graphic display of long count dates in several styles, including "face" and "symbol" glyphs, and "Codex" style Examples of inscriptions Help screens that explain the Maya calendar Input dates (in the Epigrapher''s Tool''s section) as Maya long counts, Gregorian and Julian dates, or Julian day numbers Instant conversion between all three versions of the GMT correlation Display Quiche and Aztec as well as Maya calendar round dates Day and Katun auguries from the Books of Chilam Balam Maya Astronomy: Moon age, Venus, and eclipse information Distance Date calculator Convert Ring and Serpent numbers to long count positions Days between calendar round dates (Classical and Post-Classical style) Period End dates Reconstruct dates with missing coefficients

Over 120000 stars from the Hipparcos Catalogue with name and infos for the brightest ones. Planets and major satellites in real time (position computation now accurate enough for eclipse or transit simulation). Drawing of the 88 constellations with their names. Mythological figures of the 88 constellations. Textured displaying of more than 70 nebulas (Orion, M31 etc..). Photo-realistic Milky Way. Star twinkling. Shooting Stars.

Calculates the current moon phase together with several other astronomical data, like the distance of the sun and the moon, the rise and set, equinixes and solstices, eclipses. Also calculates moon-related holidays like easter, pesach, chinese new year. Full source code (Delphi) available at webpage.

Planet’s Visibility presents a 3-color graph that shows when a planet, the moon or the sun is visible during any year from 3000 BC to AD 6000 at any location on the earth. The vertical axis marks the months of the year, the horizontal axis marks the hours of the day. The three colors create a contour map effect and show whether the body is under the horizon (black) and invisible, above the horizon with the sun (light color) and invisible, above the horizon without the sun (shaded color) and so possibly visible. The times of sunrise and sunset can be shown on all the diagrams. By moving the mouse over the diagram, the date and time along with the object’s altitude, azimuth, and magnitude, or the phase of the moon, are displayed. In addition, Planet’s Visibility computes the dates of visibility phenomena, first and last visibility, acronychal rising and cosmical setting, with much supplementary information. These phenomena are very useful for historical purposes. Since the computation of these phenomena is complex and uncertain, alternate methods are provided and parameters can be altered by the user to find what appear to be the best results. There are also diagrams of solar and lunar eclipses, of the rotation, inclination, illumination, and apparent size of the bodies, and of Jupiter’s satellites. The settings for the computations may be saved, the graphics may be saved, pasted into do*****ents, and printed, and the tables for visibility phenomena may be ac*****ulated, edited, printed, and saved as .rtf files to be pasted into do*****ents and printed.

Solar Eclipse Viewer is a 32-bit astronomical program for Windows to search for solar eclipses and d

ChaosPro not only creates Julia and Mandelbrot sets of any formula (using either one of about 20 built in formulas or using a user defined formula), it can create bifurcation diagrams, IFS fractals, Plasma fractals, Lindenmayer systems, dynamic systems like the Lorenz attractor, the Rossler attractor, and Lyapunov Spaces (more to come). ChaosPro not only wants to be able to create nice images, it wants to be more: There are two kinds of people interested in fractals. The one group is only interested in nice images, not knowing much about the math, the theory of fractals, etc. these people like programs like UltraFractal, Tierazon, Fractal eXtreme (and perhaps ChaosPro?). And then there is another group of people: People interested in the theory, the math, and these people want to explore fractals, they want different fractal types (different in the formula, different in the whole algorithm). These people mainly used FractInt simply because no other program offers so many interesting fractal types. Those people seem to love fractals like bifurcation diagrams or lorenz attractors, boring images, with interesting math behind them. And that''s the reason why ChaosPro offers such fractal types. Happy exploring :-)

This program offers animated GIFs on physics and theoretical explanations to them. It was prepared in the form of compiled CHM-archive with hyperlink and search possibilities. One-frame images appear instead of videos if you work off-line.