Sunrise to Sunset Lite is a location aware sunrise and sunset calculator. It makes use of the GPS in the iPhone to determine the location and then calculates the sunrise and sunset for a given date in that location. Also shows the length of that day. You can choose between Official and Astronomy modes to determine sun rise and sun set times. The full version features two more modes Civil and Nautical. Also in the full version, a special feature called the "Geographic time" is provided for calculating the actual geographic time for the location.