JPH0222857B

PURPOSE:To cause no shifting of solar ray collection even in the changes of configuration of various parts of a solar ray collector, which occurs at the installation of the solar ray collector or results from secular fluctuation or the like, and consequently make the adjustment of a tracking mechanism for solar ray collection unnecessary so as to obtain a sun tracking solar ray collector with simple structure by a method wherein light detectors, which are installed with different angles one another and outputs of which are inputted to dividers respectively, are employed. CONSTITUTION:The outputs of two light detectors 11 and 12, which are installed with different angles each other, are inputted to a divider 14 so as to obtain the value of the output of the detector 11 divided by that of the detector 12 in order to input the outputted value to a calculating board 18. In addition, another light detector 13 is installed with different angle from the installation angles of the light detectors 11 and 12. The outputs of the light detectors 11 and 13 are inputted to a divider 15 so as to obtain the value of the output of the detector 11 divided by that of the detector 13 in order to input the outputted value to the calculating board 18. The direction of the sun (elvation alpha and azimuth beta of the sun) can be calculated by the calculating board 18 based upon the outputs sent from the dividers 14 and 15.