The present invention relates to a polar-axis solar tracker comprising a series of rows of photovoltaic modules (1) arranged, on support structures formed by stringers (2) and longitudinal shafts (3), wherein the support structures of the rows of photovoltaic modules (1} are articulated in rotating assembly by means of hinges (8 and 9) which establish an axis of rotation parallel to the shaft (3) of said support structures of the photovoltaic modules (1), having an operating system (5) which actuates the longitudinal movement of a bar (6) , which actuates the pivoting rotation of the support structures of the photovoltaic modules (1) on the corresponding hinges (8 and 9) through the connecting rods(7).
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