The topic of this project was to deal with measured solar radiation and other weather data from Asiaq station 515, sisimiut, Greenland in spring 2004 to make investigations and determinations about the available solar energy in high latitudes; determine the solar radiation on tilted surfaces from radiation on horizontal with the help of different solar radiation models for the test period, and compare the results to the measurements, Determine the ground reflectance during the test period.