The app uses iOS location services to calculate sun and moon rise/set times. The apps stores your last location and desired alerts in the app's user preferences. These preferences are only stored on your iOS device and backed up by Apple based on your iOS settings.
The app does not collect any other information. It does *not* transmit your location, alert settings, or any other piece of data to any server of any kind.
Questions? E-mail email@example.com.