AN APPARATUS AND A METHOD FOR DETECTION SUNSHINE VOLUME

Provided is an apparatus for detecting an amount of sunlight, which allows precise detection of the amount of sunlight regardless of the season or weather while allowing display of the sunlight period. The apparatus for detecting an amount of sunlight comprises: a main sensor(3) mounted to the center of the circumference of a rotation cylinder(1) surrounded with a housing; a plurality of first supplementary sensors(7) and second supplementary sensors(9) disposed at predetermined intervals on a circular circuit board(5) fixed on the rotation cylinder(1) along the left and right circumferential surfaces on the basis of the point(P) in which the external surface intersects the vertical line extending from the main sensor; a drive member(13) transmitting power to the rotation cylinder(1); and a controller(11), which outputs control signals for driving the drive member so that the rotation cylinder rotates to the right or left side until the difference between the average value of sensor signals received from the first supplementary sensors(7) and that from the second supplementary sensors(9) is in the acceptable error, and detects the amount of sunlight by using the signal value of the main sensor, when the difference is in the acceptable error so as to output the amount as the sunlight period.