NOVELTY - The array has a support assembly supporting photovoltaic devices to be pivotable about a pivot axis (A), where the support assembly comprises a pivot supporting photovoltaic devices and including an outer surface (266). A bearing supports the pivot to be pivotable about the pivot axis. A pier (200) supports the bearing at a position above a support surface, and comprises a reduced friction bearing element (222), with a partially toroidal inner surface (264) positioned to slide against the outer surface of the pivot when the pivot pivots about the pivot axis.    USE - Sun-tracking photovoltaic solar power collector array such as non-concentrated photovoltaic solar power collector array and concentrated photovoltaic solar power collector array, for use in solar energy collection system such as non-concentrated photovoltaic solar energy collection system and concentrated photovoltaic solar energy collector system. Can also be used for concentrated thermal solar systems.    ADVANTAGE - The array reduces labor, hardware and cost associated with installing the solar collection system, and reduces cost of manufacture and/or installation of bearings. The lower portion of the housing is fixed in place along with a portion of the bearing element and the torque tubes are lowered down onto the lower portion on the associated bearing element when the solar energy collection system is being installed, so that a remaining portion of the bearing assembly is completed, thus facilitating convenience of the solar collection system since torque tube assemblies are quite long and heavy. The array provides a connector for connecting the bearing element to the lower portion of the housing so as prevent movement of the bearing element during installation procedure in axial and circumferential directions. The upper portion includes apertures as same as apertures on the outer surface so as to cooperate with the protrusions on the bearing element, thus simplifying installation procedure.    DETAILED DESCRIPTION - The pier is a single post. The pivot is a torque tube. An INDEPENDENT CLAIM is also included for a bearing assembly.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a bearing assembly with upper and lower bearing elements and upper and lower bearing housing portions.    Pivot axis (A)    Bearing assembly (20)    Pier (200)    Reduced friction bearing element (222)    Partially toroidal inner surface (264)    Outer surface (266)