The iPhone-App gtSundowner offers the following functionalities
- Calculate the times for Sunrise, Sundown,Time from now to Sundown for the current location
- Playing an alert in advance to Sundown or Sunrise, time may be adjusted by a settings dialog
- Calculate and show Moonphase, Age of Moon and Visibility of the Moon for the current location and timezone
- Calculate Sunrise an Sundown for any give location
- Recipes for popular Sundowner drinks included
- Write down own sundowner recipes with an editing view