Stellarium is a stellar sky simulator.

It puts the shifting and changing beautiful night sky on a star watcher’s computer screen deplete of city lights. Users can fast forward or rewind time to see how stars shift position over time. Otherwise, you can just watch the moon, sun, and stars go by at your location in real time without braving the great outdoors.

Curious what the other hemisphere looks like at night? Just remove the ground and see the big picture. Or watch the zodiac go by when the constellation options are checked. Visit stellarium.org and figure out where the north star (Polaris) was 4,000 years ago for the same price as going outside. Free.