It will also go a long way toward determining if a person is actually interested in going out at night and looking at celestial objects enough to warrant buying a telescope...I bought one about thirty years ago and sold it about twenty without much use. I've got one sitting in a closet now that was bought about fifteen years ago and given to my child about ten years ago...and after fooling with it a couple of times back then, it's been sitting in a closet ever since. My limit seems to be about a full moon.