One of the most complex wristwatches ever made
There's one complication that I've seen in another watch and that puzzles me a lot.On its back this watch has sunrise/sunset times. These times are derived from a so-called sunrise equation [1] which depends on the day of the year and the latitude, and is expressed via trigonometry functions.I can see how this can be translated into some sort of irregularly shaped gear(s) if there were a single variable (the day of the year), but I have no idea how one could also allow for different latitudes.Does anyone know or care to guess?[1] https://en.wikipedia.org/wiki/Sunrise_equation