Features/modules include:

• Eclipse, saros cycle. Has two main parts: the study of the saros cycle with the help of a program written in language BASIC, and the study of sequences and maps of visibility of eclipses.
• Firmament. Allows to represent the firmament from any town and date.
• Disks and coordinates. Simulates the apparent aspect of the Sun, the Moon, planets and satellites like they would be observed from a certain town.
• Solar system I. Represents the trajectories in the sky of the planets, comets, and asteroids, in order to identify the dates of the opposition, conjunction, stationary points, and quadratures...
• Ephemerides. The objective is double: 1) to study the code of a program of ephemerides calculation in language FORTRAN 90; 2) to carry out a practical calculation of ephemerides to obtain the apparent equatorial coordinates of a planet, using the subroutines of the code .
• Solar system II. This practice allows to study the heliocentric Solar System. The program presents the planets, and some comets and asteroids.

You may get the program from the link above or you can use the Emule network/P2P client (edk2 link): Prácticas De Astronomía Observacional v1.2 (Software Gratuito De Astronomia Ideal Para Escuelas Y Universidades).zip

Furthermore, Sssim Studio contains aurthoring tools of its autoplayscripts and also the ability to share the content over the internet.

As a result you need to be able to create objects to populate the universes you create. At a minimum this would require specifying mass, position and velocity. Bells and whistles include the object's name, size, color or bitmap, and spin rate, axis and phase. Additionally, as an observer in your universe you can specify where you are, which direction you are looking in, which way is up. Finally, in order to make sense of doing something like zooming your view in on something, you need to specify how far along your line of sight you are looking.

Gravity 6 has a point and click or point and drag interface with some sensible defaults for object creation and for creating stable orbits. You can optionally drill down and specify any of the above details numerically allowing the modelling of precise situations should you so wish.

The screen shot at your right depicts an imaginary model where the Earth is orbiting Saturn.

Also gives information on the mythology and the spacecraft missions aimed at each one.

Eccentricities become observable when time is controlled and the affect of a highly inclined axis like that of Uranus become very apparent when its year is reduced to a few seconds. Planets etch out epicycles in the sky when viewed from other bodies. The sim will demonstrate this process when you watch, for example, Mars from the Earth system.

Note: Requires DirectX 8.1 or later.