Time-lapse videos are amazing. You can watch natural phenomena unfold that would take too long with the unaided eye.
Time-lapse pros use expensive, high-tech equipment to get their shots. If you want to try your hand at it, however, it only takes a few bucks.
Your smartphone can make time-lapse movies no problem. Just grab Lapse It.
You can set how frequently the camera snaps a picture. Then the app will put the images together in a movie file. You just need to tap a button.
Well, you also need to figure out a good way to keep your phone pointed where you want. There are plenty of low-cost tripod hacks people have come up with online.