Pebble watch application to show current daylight overlay on a world map. Download the binary (requires SDK 2.0) here. For SDK 1.0, here is the old download.
It looks like this:
You can scroll left & right with the UP/DOWN buttons. SELECT button opens settings where you can configure your latitude/longitude and whether sunrise/sunset information is displayed.
Based loosely on the concepts in Math behind a world sunlight map.