increased temperature then the reference voltage source 401 is supplied to the light reception patterns 201 and 202 sequentially by the turn on operation in the switching unit 402 and the alteration in voltage of the light reception patterns 201 and 202 s measured by utilizing the voltmeter 500 through these operations the temperature of the light reception pattern with condensed sunlight is increased compared to those of the light reception patterns without sunlight condensed thereto and the resistance coefficient is altered if the reference voltage source 401 is supplied the voltage is altered in short voltage is altered in a light reception pattern with alteration in the resistance coefficient but the voltage remains unchanged in the other light reception patterns without sunlight condensed thereto the light reception pattern with condensed sunlight can be found in this method if the light reception pattern with condensed sunlight is found out the position of sunlight reception points can be confirmed as described above the technology of the present invention can examine many light reception patterns with one voltmeter 500 by combining them with the counter it can also form the light reception pattern in a delicate copper pattern to thereby fabricate a solar position tracing sensor with a high resolving power since the printed circuit board used in the present invention is what is commonly used for the fabrication of a semiconductor device it is reliable and cost saving as set forth above since the tracing sensor of the present invention utilizes a temperature characteristic and excellent heat conductivity of the.