Newton 2D for Windows
This freeware program presents a moving graphical simulation
of a system of up to ten bodies that obey Newton's laws in a
two-dimensional universe. You can get a feel for
orbital mechanics, watch Jupiter perturb the orbit of an
asteroid, design your own planetary systems, and spend many
hours watching the evolution of multi-body systems.
One Hypothetical System
The mass, velocity and position of up to ten objects can be
specified individually. A rudimentary circular orbit
calculator aids in the preliminary setup of a universe.
The Object Editor
The observer's point of view can be moved, rotated, zoomed
and locked to any object. Simulations may be saved and
This application is free for non-commercial use and
distribution. See the "Obtaining and Distributing"
section of the help file. The current distribution
package is here.