The invention includes a fixed platform bearing a circular rail, supporting rolling elements to which is attached a mobile frame with a sloping structure which holds a number of solar panels, grouped in rows, the panels of each row being connected to corresponding support shafts, supported on the sloping structure, and a device for moving the frame and shafts in accordance with a predetermined configuration. The frame includes a base with attached thereto the rolling elements and the sloping structure is raised above the base, at a distance from the fixed platform and formed by two supporting beams that delimit an oblique plane and are separated from each other by a distance greater than the diameter of the rail.