NOVELTY - The tracker has a series of rows of photovoltaic modules (1) arranged on support structures formed by stringers (2) and longitudinal shafts (3). The support structures of the rows of photovoltaic modules are articulated in a pivoting rotation assembly by hinges (8, 9), which establish an axis of rotation parallel to the shaft of the support structures of the photovoltaic modules. A rotation operating system (5) actuates longitudinal movement of a bar (6), which actuates pivoting rotation of the support structures of the modules on the corresponding hinges through connecting rods (7).    USE - Polar single-axis solar tracker.    ADVANTAGE - The tracker allows the photovoltaic modules to be orientated toward sun so as to capture sunlight with the photovoltaic modules during maximum time in an effective manner. The hinges are secured to the shaft of the support structure of the photovoltaic modules, and include articulation bolts, which are in a position parallel to the shaft of the support structure of the photovoltaic modules such that the group of photovoltaic modules is rotated about the bolts of the hinges, so that allowances produced in the tracker with the rotation about the shaft of the support structure of the photovoltaic modules can be eliminated in a cost effective manner, thus providing precise rotation of the photovoltaic modules of the tracker, and hence effectively capturing solar energy. The tracker allows stress in which the shaft of the support structure of the photovoltaic modules has to withstand to be reduced, thus providing fewer breakdowns, and hence providing less maintenance. The tracker allows the rotation of photovoltaic modules that does not take place directly about the longitudinal shaft of the support structure supporting the photovoltaic modules.    DESCRIPTION OF DRAWING(S) - The drawing shows a bottom perspective view of a solar tracker, a support structure of photovoltaic modules and a rotation system.    Photovoltaic module (1)    Stringer (2)    Longitudinal shaft (3)    Rotation operating system (5)    Bar (6)    Connecting rod (7)    Hinges (8, 9)