A number of users of the free Distant Suns-Lite application have asked what the difference was between that and the paid version. The biggest is simply that the paid version will let you set the date/time, whereas DS-Lite only shows the sky for the current time. The paid app also has a number of navigation accelerators, more data, clock acceleration to study the motions of the planets, and a number of other smaller tweaks. Also, DS-Lite will stay as is, save for any bug fixes. Whereas Distant Suns will continue along a path of regular upgrades. That said, if you have DS-Lite and it serves all of your needs, great! But if you want a richer experience than pick up the other one. After-all it’s not THAT expensive. And you’ll feel better afterwards.