| 摘要 |
A device and method to automatically control timing of outside lighting are achieved. An ephemeris program and a calendar are loaded into memory on a timing device. Power is applied to the device wherein a GPS circuit on the device is energized, and Greenwich Mean Time (GMT), Current Day (CD), and physical location of the device are determined from satellite signals through an antenna or alternately from a repeater circuit or a key fob type device. GMT and CD that are retrieved are stored in memory. Lighting on and off times are calculated by the ephemeris program based on physical location, the calendar, GMT, CD, and the user selected distance of the sun below the horizon. Lights are turned on and off based on the calculated on and off times.
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