Have you seen the International Space Station? This app is saving the photos has filmed by ISS. Those photos have geo location and Time(UTC) information. ISS is about 400km above ground in the space. It makes an around the earth in 90 minutes. It is about 8km per second. You can see all of the earth because ISS is flying angle 51.6 against the equator. you can see the International Space Station with your own eyes passing over you. If it is good condition then, ISS is brighter than other star.