You just needed to configure your latitude so it knew when sunset was. Mechanical timers have never "been able to do this". Sunset time changes on a daily basi

You just needed to configure your latitude so it knew when sunset was. Mechanical timers have never "been able to do this". Sunset time changes on a daily basis. In Seattle that can be anywhere from 4:15 to 9:30 p. m. That's fine if one finds +/- 2.5 hours acceptable. Others have more precise needs.