An electronic visible light sensor is employed to detect the presence or lack of sunlight. The simple, digital light/dark data from the sensor is fed to electronic circuits which control security and other devices dependent upon day and night status. These circuits are directed and controlled in turn by associated electronic circuits that gather data which measures the length of the solar night, that is, between dusk and dawn, and by deduction, the length of the day. Given that these time periods vary daily and in a regular fashion, the result will necessarily differ by a few minutes each and every day during the 365 day solar year. The resulting day/night time data is used to estimate, with say, a four to ten minute accuracy, taken against the Universal Coordinated Time System, to establish start/stop times, durations and cycles of security and other devices dependent upon the presence or lack of sunlight relative to UCT designated within the universally accepted twenty-four day. These results are fed to the security control circuitry to define control of data to security and other devices.

An electronic visible light sensor is employed to detect the presence or lack of sunlight. The simple, digital light/dark data from the sensor is fed to electronic circuits which control security and other devices dependent upon day and night status. These circuits are directed and controlled in turn by associated electronic circuits that gather data which measures the length of the solar night, that is, between dusk and dawn, and by deduction, the length of the day. Given that these time periods vary daily and in a regular fashion, the result will necessarily differ by a few minutes each and every day during the 365 day solar year. The resulting day/night time data is used to estimate, with say, a four to ten minute accuracy, taken against the Universal Coordinated Time System, to establish start/stop times, durations and cycles of security and other devices dependent upon the presence or lack of sunlight relative to UCT designated within the universally accepted twenty-four day. These results are fed to the security control circuitry to define control of data to security and other devices.

Provided are an electronic circuit and electronic timepiece that can initialize internal circuits even if chattering occurs when a battery is installed. In the electronic circuit, when the initialization state hold signal is input, the initialization control circuit continues outputting the initialization control signal at the first level until the clock signal is output; and when the initialization state hold signal is input and the clock signal is output, outputs the initialization control signal at the second level cancelling the initialization process to the initialization circuit.

Provided are an electronic circuit and electronic timepiece that can initialize internal circuits even if chattering occurs when a battery is installed. In the electronic circuit, when the initialization state hold signal is input, the initialization control circuit continues outputting the initialization control signal at the first level until the clock signal is output; and when the initialization state hold signal is input and the clock signal is output, outputs the initialization control signal at the second level cancelling the initialization process to the initialization circuit.