Soltider

- sets the time of sunrise and sunset without the use of internet or GPS for selected destinations
- shows the graph of the day's length over the year
- sunrise and sunset are calculated from date, longitude and latitude (see: https://www.aa.quae.nl/en/reken/zonpositie.html)
- The source code is freely available here: https://github.com/hhsievertsen/soltider