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
Attention: Continued use of GPS running in the background can dramatically decrease battery life.