Electronic timepiece and control method of electronic timepiece

A control method of an electronic timepiece that has two threshold values of a first threshold value for determining a voltage value of a solar power source and a second threshold value which is smaller than the first threshold value, and that clocks the time by driving a rotating body at first hand operation speed and at second hand operation speed which is faster than the first hand operation speed, the method comprising:

• a voltage stabilizing procedure in which a voltage stabilizer circuit generates a constant voltage by using power supplied from the solar power source;
• a procedure in which a control circuit drives the rotating body by using a voltage of the solar power source in a case of the first hand operation speed;
• a procedure in which when the voltage value of the solar power source is greater than the first threshold value, the control circuit drives the rotating body at the first hand operation speed by using the voltage of the solar power source, and drives the rotating body at the second hand operation speed by using the constant voltage;
• a procedure in which when the voltage value of the solar power source is equal to or smaller than the first threshold value and equal to or greater than the second threshold value, the control circuit drives the rotating body at the first hand operation speed and at the second hand operation speed by using the voltage of the solar power source;
• and
• a procedure in which when the voltage value of the solar power source is smaller than the second threshold value, the control circuit drives the rotating body at the first hand operation speed by using a voltage whose voltage value is smaller than the voltage value of the solar power source, and switches the voltage so as to stop driving the rotating body at the second hand operation speed.