Here is a website for the amateur astronomer. It appears to be a website for an introductory astronomy class. It contains various simulations that include measuring the stellar parallax, eclipsing binary stars, a binary star system and Stellar Evolution. When you click on one of these simulations you view each in motion. Underneath each simulation is a description of the simulation and an explanation of what is occurring. Finally, if you so desire, you can enter in different values and then see how those different values change the simulations. An interesting website for people just beginning their studies in astronomy.