A single axis solar tracking assembly comprising: a spine having a plurality of spine sections connected to one another by universal joints, each spine section having a longitudinal rotation axis; supporting legs rotatably supporting said spine sections on the ground; a plurality of brackets attached to each of the spine sections; a plurality of rib members connected to said brackets; and at least one solar panel secured to each of said rib members, said at least one solar panel having a solar radiation collecting surface; wherein the rib members together with said solar panels are moveable with respect to the spine sections between a folded position and a deployed position; wherein an auxiliary shaft is located between adjacent universal joints connected to adjacent ends of two adjacent spine sections; and wherein each of said universal joints comprises a cross member defining perpendicularly crossed first and second spine hinge axes (13, 14), a first yoke rigidly attached to one end of one of the spine sections and connected to said cross member to rotate about said first spine hinge axis, and a second yoke rigidly attached to one end of said auxiliary shaft and connected to the cross member to rotate about said second spine hinge axis, characterized in that: one of the first and second spine hinge axes (13, 14) of the cross member of each universal joint is parallel and the other is perpendicular to said solar radiation collecting surface of the solar panels when the solar tracking assembly is in an intermediate position in which the rib members together with the solar panels are in said folded position and said longitudinal rotation axis of the spine sections is aligned or near to aligned with the auxiliary shaft, thereby each spine section is foldable at right angles with respect to the auxiliary shaft and the plurality of spine sections are foldable in a zig zag fashion from said intermediate position into a compact storage position in which the solar radiation collecting surfaces of the solar panels are arranged in adjacent parallel planes. a spine having a plurality of spine sections connected to one another by universal joints, each spine section having a longitudinal rotation axis; supporting legs rotatably supporting said spine sections on the ground; a plurality of brackets attached to each of the spine sections; a plurality of rib members connected to said brackets; and at least one solar panel secured to each of said rib members, said at least one solar panel having a solar radiation collecting surface; wherein the rib members together with said solar panels are moveable with respect to the spine sections between a folded position and a deployed position; wherein an auxiliary shaft is located between adjacent universal joints connected to adjacent ends of two adjacent spine sections; and wherein each of said universal joints comprises a cross member defining perpendicularly crossed first and second spine hinge axes (13, 14), a first yoke rigidly attached to one end of one of the spine sections and connected to said cross member to rotate about said first spine hinge axis, and a second yoke rigidly attached to one end of said auxiliary shaft and connected to the cross member to rotate about said second spine hinge axis, characterized in that: one of the first and second spine hinge axes (13, 14) of the cross member of each universal joint is parallel and the other is perpendicular to said solar radiation collecting surface of the solar panels when the solar tracking assembly is in an intermediate position in which the rib members together with the solar panels are in said folded position and said longitudinal rotation axis of the spine sections is aligned or near to aligned with the auxiliary shaft, thereby each spine section is foldable at right angles with respect to the auxiliary shaft and the plurality of spine sections are foldable in a zig zag fashion from said intermediate position into a compact storage position in which the solar radiation collecting surfaces of the solar panels are arranged in adjacent parallel planes.