"Help us to georeference the position of cities which appear in the ISS images. We are members of the Group of Extragalactic Astrophysics and Astronomical Instrumentation from the of Universidad Coplutense de Madrid. Among our activities is a study of light pollution and the energy consumption derived from it. We use images taken from the International Space Station as part of our investigations, provided by Earth Science and Remote Sensing Unit, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." To compare the images with the different light sources on the earth, we need to know the city's location. Due to the large number of images, we need your help. Some of these pictures are from unknown locations for us, and it is very difficult to identify them in the pictures. However, a lot of people around the world will know the cities. We need you to identify the cities and connect them with their position point on the map. This application allows you to do this."