Here is example of time switch with solar dial [1][2]. Big Clive explains its internals a bit. The dial seems to be made for specyfic latitude as cams are set a

Here is example of time switch with solar dial [1][2]. Big Clive explains its internals a bit. The dial seems to be made for specyfic latitude as cams are set and only input is day of the year. I think that it can be made to use latitude input with some more complex set of cams and user setable input. 1. https://www.youtube.com/watch?v=3i_vfsuCpJY https://www.youtube.com/watch?v=3i_vfsuCpJY 2. https://en.wikipedia.org/wiki/Solar_dial https://en.wikipedia.org/wiki/Solar_dial