Desktop Earth is a wallpaper generator. It will generate a high-resolution, accurate representation of the Earth. The imagery is based on NASA’s Blue Marble Next and Earth’s City Lights.
Day and night is accurately represented depending on the Sun’s overhead position (which depends on both the time of day and the day of the year) and both the snow cover and the foliage changes with the seasons. The program is downloadable from the hyperlinked 70s.orgsite or has the option to get a current snap-shot to view in your browser. If you don’t have enough RAM, the desktop program could tax your resources.