Sunrise Sunset Calculator (com.kbsbng.androidapps.sunrise_sunset_calculator) on Google Play
The Sunrise Sunset Calculator is a free application that lets you find the following timings for either your current location or any given location on the earth:1) Sunrise and sunset2) Civil Dawn and Dusk3) Nautical Dawn and Dusk4) Astronomical Dawn and DuskThe computation is done using the formulae at http://williams.best.vwh.net/sunrise_sunset_algorithm.htm. Note that since these formulae do not take into account the elevation of the place, the computed values may be slightly inaccurate for places much above sea level.The Sunrise Sunset Calculator also has the following features:1) It lets you to set alarms at sunrise, sunset and any of the above dawn or dusk times.2) It lets you search sun in the sky map.All of the features currently supported by the app are free.