Stellarium is free, open source software that simulates the night sky as it would appear from anywhere anytime (no foolin’ I promise). It’s used by professional planetariums, but you can download it to your Windows, Apple, Linux or Ubuntu machine.

Here’s one more fun thing – a simulation where you can change the mass of the Sun, Earth, or Moon and see how it affects the orbits of all three. If you make the Sun too big, the Earth gets sucked into it, but if you make it too small, the Earth just flies out into space. It just reminds us that we are lucky to be here. There’s also a similar simulation where you can make up your own planets and see how they would orbit a star and each other.