Developer's DescriptionBy Jester DevSunCalc+ is a simple app that will give not only sunrise and sunset times but also astronomical, nautical and civil twilight (dawn and dusk)...SunCalc+ is a simple app that will give not only sunrise and sunset times but also astronomical, nautical and civil twilight (dawn and dusk) times. You can choose a date and location. SunCalc+ is completely free and very easy to use.All functions:- sunrise- sunset- day length- solar noon- astonomical dawn- nautical dawn- civil dawn- astronomical dusk- nautical dusk- civil duskThe app requires GPS(to get your location) and internet(to download a small amount of astronomical data) to work properly.