Patent ID: 7386424

Claim:
An electrical distribution system for selectively connecting an electrical power source to a load device using astronomical calculations, comprising: a switching device electrically connected between an electrical power source and a load device for selectively delivering electrical power to the load device; a control system for controlling operation of the switching device, the control system comprising a programmed controller for commanding operation of the switching device in accordance with a scheduling routine stored in a memory, the scheduling routine enabling control of the switching device based on sunrise and sunset time, the memory further comprising a database of a plurality of geographic locations and coordinate information for the plurality of geographic locations, the control system further comprising a setup routine comprising a user interface displaying a list of available geographic locations and enabling a user to select one of the plurality of geographic locations and a manager routine automatically operable each day to calculate sunrise and sunset times for the day using the coordinate information, comprising latitude, longitude and time zone, for the selected geographic location and providing the sunrise and sunset times to the scheduling routine.