CyberSky 5.0
CyberSky is an accurate, yet easy-to-use planetarium program that provides an excellent way to learn about astronomy and explore the sky visible in the distant past, the present, and the far-off future. CyberSky can display and print attractive, highly-customizable maps of the sky as seen from your home, your favorite vacation spot, or any other location on the Earth. The program’s clean, user-friendly interface makes it easy to identify the...
Price: USD $34.95;
License: Shareware (Free to Try)
File Size: 7877 KB;
Platform: Windows Vista, Windows XP , Windows 7

Gnomon Model 1.0
Gnomon shadow simulation to help you with your studies. The EJS Gnomon model simulates the shadow cast by a gnomon (the part of a sundial that casts the shadow) over the course of a day for any day of the year and any latitude on Earth. The software gives you the option to use mean Sun (which moves relative to the stars at a constant rate throughout the year) or true Sun (which varies its apparent speed relative to the background stars). The...
Price: USD $0.00;
License: Freeware
File Size: 1167 KB;
Platform: Windows

Earth Orbit Model 1.0
Copernican theory illustration. Earth Orbit model illustrates the Copernican theory of Earth's orbit around the sun. The top window shows a view from outside the celestial sphere. The simulation shows the moving Earth along with its axis or rotation and the line of sight from Earth, through Sun, to the Celestial Sphere. The end of the arrow indicates where, on the Celestial Sphere, Sun appears to be located as seen from Earth. The tilt of...

Phases of Venus Model 1.0
Simulate the Venus phases with this tool. Venus Phases model shows the shadows cast by two gnomons at different locations on Earth. For one gnomon the sun is directly overhead (as would be the case if the gnomon was on the Tropic of Cancer at the summer solstice). The other gnomon is due north of the first gnomon. The sizes of the gnomons are outstandingly exaggerated for visibility. This simulation can be used to help illustrate how...

Ptolemy/Copernicus/Tycho EJS Model 1.0
Comparison between three famous planetary models. Ptolemy/Copernicus/Tycho EJS Model illustrates the relationships between the systems of planetary astronomy developed by Claudius Ptolemy, Nicholas Copernicus, and Tycho Brahe. The model presents a simplified version of all three systems, showing the motions of the Sun/Earth and two planets (one inferior, one superior). The model is initially set to model the planets Venus and Mars. In...

Oscillations and Lissajous Figures Model 1.0
Two perpendicular harmonic oscillators motion simulation. Oscillations and Lissajous Figures model displays the motion of a superposition of two perpendicular harmonic oscillators. The simulation shows the result of the superposition. The amplitude and frequency of the oscillators can be changed via textboxes. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model"...

Double Pendulum Model 1.0
Analyze the double pendulum motion with this application. The Double Pendulum model displays the motion of a double pendulum and its Poincare map. A double pendulum is a pendulum with another pendulum attached to its end and the state of this dynamical system is specified by two angles and two angular velocities. Because there is no fiction, the double pendulum is an example of a Hamiltonian system and energy is conserved.?This EJS model...

Faraday Disk Dynamo Model 1.0
Analyze magnetic field with this tool. The EJS Faraday Disk Dynamo shows a conducting disk that rotates in a magnetic field. This produces a current (homopolar generator) and for certain configurations, it is a self-exciting dynamo. A self-exciting dynamo is the mechanical analog of a proposed mechanism to produce the earth and sun's magnetic fields. You can modify this simulation if you have Ejs installed by right-clicking within the plot and...

Cellular Automata Rules 1.0
Analyze nearby neighbor rules with this tool. Cellular Automata Rules is a simple, very convenient, Java based software designed to display a spatial lattice that can have any one of a finite number of states and that are updated synchronously in discrete time steps according to a local (nearby neighbor) rule.You can change the lattice size, pick different rules (0 to 255 as classified by Stephen Wolfram), and choose different initial starting...

Uniform Spherical Distribution Model 1.0
Pick a random point on the surface of a sphere with this simulation. The EJS Uniform Spherical Distribution Model shows how to pick a random point on the surface of a sphere. It shows a distribution generated by (incorrectly) picking points using a uniform random distribution as well as the correct weighted distribution. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs...

Coupled Oscillators and Normal Modes Model 1.0
Analyze coupled oscillators motion with this tool. Coupled Oscillators and Normal Modes model displays the motion of coupled oscillators, two masses connected by three springs. The initial position of the two masses, the spring constant of the three springs, the damping coefficient for each mass, and the driving force and driving force frequency for the left mass can be changed via text boxes. You can modify this simulation if you have Ejs...

QM Momentum Measurement 1.0
Study the position-space wave function with the help of this simulation. QM Momentum Measurement software displays the time evolution of the position-space wave function and can be used to simulate the quantum-mechanical measurement of momentum. The default wave function is an equal-mix four-state superposition in the infinite square well.QM Momentum Measurement is one of 18 Open Source Physics programs that model time-dependent quantum...

Noon Shadow Model 1.0
Analyze the shadow cast by a gnomon at noon with this tool. The Noon Shadow model shows the geometry of the shadow cast by a gnomon at noon. Users can change the orientation of the gnomon as well as its latitude. The height of the gnomon and its shadow length are displayed in Earth radius units.Noon Shadow model is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_astronomy_Noon Shadow.jar file will run the...

Polarizer Program 1.0
Plane polarizer effect simulation. Polarizer software displays the effect of a plane polarizer on an incident electromagnetic wave. The polarization of the electromagnetic wave and the orientation of the polarizer can be modified.Polarizer is an Open Source Physics software written for the teaching of optics. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the optics_polarizer.jar file will run the software if Java...

Relative Motion on an Elevator 1.0
Study motion in one dimension with the help of this simulation. Relative Motion on an Elevator model displays the relative motion as seen by two classical observers.The eith-years old kid Pepe Neurons plays YoYo in an elevator with transparent walls in a shopping mall. His sister, Lola, looks at him from the ground floor of the shopping mall while he does so. This simulation allows you to watch the motion of the kids, the elevator and the yoyo...