To celebrate Curiosity the folks who do SkySafari for iPads and iPhones have the app marked down - the basic app is more than enough for most people and is now FREE. The more advanced versions have healthy markdowns, but you'll only need them if you are a regular sky watcher.
They also have a big sale on the OS X normal and Plus versions for your iMac or MacBook. The basic version is free. The Pro version is also discounted, but only as a download from them.
These are descendants of the Voyager planetarium program from 1989 and it is still one of the best - highly recommended! I've been a user since the early beginning.
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