I usually keep *all* astro-related apps on my i-devices. But not this one!
The "free" version includes banner ads across the bottom AND is crippled by many missing features. The interface is confusing and cluttered. Rows of icons appear, disappear, and an odd message about "drag this cursor" shows up, but doesnt seem to work.
This is my second time trying this app. The first time I deleted it because they placed an always-on clock in the upper left that displayed seconds and hence was perpetually in motion. It was visually distracting. Theyve dropped that, but still leave a clock in space-- and a Facebook icon on the screen, too!
In addition, the display and interface are poor. The banner adverts for games across the Bolton is tawdry. The top portion of the screen is blocked by a set of icons--while it might be convenient to have *some* of them available--they need to be at the bottom of the screen!! Otherwise, the app completely destroys the illusion of looking out at the night sky.
Some icons are obscure and many are simple toggles.
The orrery does NOT work intuitively; other apps handle this much better.
In short, I gave up again! Your time--and energy-- to say nothing of $ -- would be better spent elsewhere on richer, fuller apps. Try some if the free or inexpensive light versions of such apps as Distant Suns, Sky Safari, Starmap, etc. Note: they wisely offer tiered versions, without adverts cluttering up the night sky! Youll find excellent orreries, too!