Excellent!!! Wonderfully simple. Look up  spot the planet or star you want to identify  face your phone towards that part of the sky with the screen towards you... and everything is instantly identified on the screen. You can also 'look' below the horizon and see where currently hidden stars  planets etc are. Obviously it needs a correct time  compass  orientation sensors and GPS location to do all this. It is quite astonishing to consider the amount of computing going into this. It works perfectly on my Note 4.
July 11 2016