TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The pivoting unit is arranged such that two annular connection elements rotate against each other around rotational axis of the pivoting unit, and the rotational axis of the pivoting unit is oriented in a rotational position of the tracking device perpendicular or parallel to the optical or technically radiation preferential direction of the radiation sensitive elements, which are mounted on the movable receiving structure, at an oblique angle. The two annular connection elements rotate against each other around the pivotal axis of the pivoting unit, and the pivotal axis of the pivoting unit is oriented in a rotational position of the tracking device perpendicular or parallel to the optical or technically radiation preferential direction of the radiation-sensitive elements, which are mounted on the movable receiving structure, at an oblique angle. Each annular structure of both pivoting unit is connected with a common mounting arrangement, and the respective other annular structure is coupled with the plant part, which is to be adjusted, on one hand and with base, chassis, or second plant part on the other hand. The common mounting arrangement is formed between the two pivoting units such that the two pivotal axes are not parallel to each other and nor perpendicular to each other. The common mounting arrangement is designed such that at least one annular structure of at least one pivoting unit surrounds both pivotal axes with all-round distance. The two pivotal axes are cut in the area of the common mounting arrangement within a connected portion. The inclination angle between the two pivotal axes, which are emerging upwards from a common intersection point on one side and downwards on the other side, is an obtuse angle. The inclination angle between two successive projectable arms of the two optionally extended pivotal axes is greater than or equal to 15 degrees , preferably less than or equal to 45 degrees . The common mounting arrangement comprises one or two flat connection parts, where the connection of the flat connection part is carried out with one or preferentially two pivoting units by means of tight fitting connection or positive connection, preferably a screw connection. The common mounting arrangement comprises at least one elongated profile with at least partially constant cross-section, preferably a straight extending elongated section with at least partially constant cross-section, preferably at least a simply connected profile, e.g. a flat steel, an angled steel, T-bar, or at least one hollow section, e.g. at least a straight pipe, preferably at least a straight cylindrical tube, preferably at least a straight, circular-cylindrical tub. At least one or both front sides of the profile lie in a respective plane, which is perpendicularly penetrated from the longitudinal axis of the tube. A different plane is not perpendicularly penetrated from the longitudinal axis of the tube. A mounting plate is fixed on at least one or both front sides of the profile, preferably aligned adjacent to the respective front side. At least one mounting plate exhibits many mounting boleholes, which are annularly arranged around the profile with an all-round distance, and is flanged to the annular structure of the pivoting unit by means of many screws passing through the mounting boreholes. At least one pinion gear and/or at least one screw are meshed with at least partially round continuous toothing. At least one pinion gear or at least one screw is coupled with a braking- and/or holding device. The toothing is present on the outer circumference of the outer annular structure of the respective pivoting unit, or on the inner circumference of the inner annular structure of the respective pivoting unit. The pinion gear or screw, which is meshed with the toothing, is arranged, guided or stored within the housing of the respective pivoting unit. At least one gear wheel, which is meshed with the toothing, is a component of a planetary gear, preferably planetary wheels. The toothing acts as the internal gear of the planetary gear. The planetary gear is designed as a Wolfrom gear, and with the internal gear divided along a main plane. The parts of the internal gear exhibit different teeth number. The connecting surfaces of the connection element are connected with at least one receiving structure via a respective pipe or rod. Many support structures are coupled together for joint, synchronous pivotal movement via rod, or common connection element of the pivoting unit. The connection element is anchored to the mounting structure using many mounting screws, which are screwed in the annularly and dispersively arranged mounting boreholes around the pivoting axis, where the center angles between the adjacent mounting boreholes and -screws is less than or equal to 60 degrees , preferably less than or equal to 30 degrees . The connecting structure comprises an annular retaining plate, which is vertically traversed from the respective pivoting axis. The retaining plate is connected with at least one lower side fastening element for mounting on the base, chassis, frame, stand, tripod, pylon or a column. The fastening element has at least a flat, horizontal lower side, e.g. at least one horizontal mounting plate or mounting bar. The mounting plate is connected with at least one mounting plate or -bar by at least one -junction and/or stiffening elements with at least one edge extending downwards at an angle from the support plate to the mounting plate and -the bar. The pivoting unit, which carries a support structure (13), and/or storage exhibits a distance to the underlying surface, which is greater than or equal to half the extension of the support structure transversely to the pivotal axis such that a space is left for other uses, preferably as a car lot or other traffic area. A cavity for threading pipes is provided within the socket, which is passes through the base up to the receiving structure. The energetic connection of an engine of the rotary drive unit is carried out within the socket. The recovery of at least one signal, which is supplied by the radiation sensitive element, is carried out within the socket. The connection of signal, which is supplied by the radiation sensitive element, with a laid underground feed line is carried out within the socket. The storage of signal, which is supplied by the radiation sensitive element, is carried out within the socket. A device for coupling the signal, which is supplied and stored by the radiation sensitive element, with a mobile load is provided at the socket. The main surfaces of all solar collectors or -reflectors, which are mounted on the common receiving structure, are planar and lie in a common adjustable plane.