Abstract: A non-electrically-powered sun-tracking solar system has a shaft, a solar panel, two roll drivers, a roll transmitter, two pitch drivers and a pitch transmitter. The shaft has a lower shank and an upper shank pivotally mounted upon the lower shank. The solar panel is pivotally mounted on the upper shank. The two roll drivers are ecliptically and bilaterally attached to the solar panel. The roll transmitter pivotally connects the upper shank and the solar panel and communicates with the two roll drivers. The two pitch drivers are meridionally and bilaterally attached to the solar panel. The pitch transmitter pivotally connects the lower shank and the upper shank and communicates with the two pitch drivers. Uneven heating by sunlight activates the roll drivers to change pitch and roll of the solar panel with the roll transmitter and the pitch transmitter for improved efficiency.