Astronomical/electronic timer switch - simple, intuitive programming of 60 switching times, either astronomical or electronic. The astronomical time control allows for automatic switching with a selectable time offset from sunrise and sunset. The astro function can be blocked independently of sunrise and sunset (for example, the lighting can be turned on no later than 8:00 PM). The electronic time control enables automatic switching after a preset time with automatic switching between summer and winter time. The manual switching preselection allows for permanent on and off via a manual switch. Programmable without a power connection. Location determination is done by selecting the nearest city or entering coordinates, along with other useful functions. Program security is ensured through PIN coding. Designed for 35 mm DIN rail.