Good start, usable, but still needs more development
It is a good learning tool to start a lunar discussion, however, kids get pretty bored just watching the app make the orbits. To improve, they need to allow the user to select dates and/or times to predict and tie information together. Also, a zoom function would help.
This was pretty good through the big LED projector.
So, this is a good beginning, and I used it in my 7th grade classroom, but to be more powerful than one day...keep going this could be really good.