Astral is a program to simulate Newton's mechanics. The program calculates the interactions between a set of particles with mass, and moves them according to Newton' laws. You can simulate our own solar system, the earth and the moon, astronomical objects, or anything you want! The program is relatively simple to use, but some basic knowledge of Physics doesn't hurt.
Here! There are two versions of the program: in Portuguese and in English. They are essentially the same, except for the language. You can downloaded them directly from this site: just look below.
Yes, the program is Public Domain. That means that it is free and you can copy it to all your friends! Of course that if you really like the program, you are feeling generous, and you want to show me your appreciation, you can always reward me for it, if you want...
Ok, here it is...
AST-P31.ZIP - Version 3.1 in Portuguese, including 24 examples. (About 115 KB)
AST-I31.ZIP - Version 3.1 in English, including 24 examples. (About 113 KB)
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Dario Oliveira Teixeira email@example.com