The Habitat Definer allows you to create an accurate profile for each basin. By entering the longitude and latitude the astronomical data, Sun and moon rise and fall as well as evening and dawn hours, will be calculated during the operation. With the help of a climat data sheet created for the habitat, which is based partly on the habitat size, it is the foundation for the sensor control. The moon visibility determines at what phase term control (switch) a moonlight lamp is placed in action.