| 摘要 |
PROBLEM TO BE SOLVED: To correspond to the sunrise and sunset time throughout the year with a small memory capacity, by storing the sunrise and the sunset time throughout the year in a memory in each arbitrary number of days for two days or more. SOLUTION: In the case of storing the sunrise and sunset time in a memory of a time switch 1, the sunrise and sunset time are stored every eight days. The sunrise and sunset time for eight days are changed every day, a center value of the sunrise and sunset time for eight days is provided with a difference from the actual time, but the difference, not so obstructing on/off control of a load equipment by the time switch, can be permitted. For instance, in the case of dividing the whole country into 10 parts, when the year is divided by each eight day, 48 kinds of the sunrise and sunset time are required, 1/8 memory capacity is only required. In addition, when the sunrise and sunset time throughout the year are stored by each (n) day, 1/n memory capacity is only required as compared with the conventional. |
