This radial family tree visualization uses a hierarchical layout to display four generations of a family, with each person’s radial position determined by their birth year. Concentric decade rings and labels from 1930 to 2020 provide a temporal context. The code uses `d3.layout.tree` with a radial diagonal projection, `d3.svg.diagonal.radial`, and maps birth years to radii via a custom `yearToY` function. Node colors vary by depth using `d3.scale.category10`, and the SVG rendering includes interactive styling for links and nodes.