Explore Zoomable Orbit
The Explore Zoomable Orbit example presents a hierarchical dataset as an animated, multi-ringed orbital layout. Nodes are positioned on concentric rings around a central root, with each depth level corresponding to a smaller ring and slower orbital speed. The visualization is implemented with `d3.layout.orbit`, which continuously updates node positions via `setInterval` and a `tick` dispatch. A custom zoom API from `d3-zoom.v2` is loaded, though the provided code does not explicitly attach zoom behavior to the SVG. The visualization uses `flare.json` data, renders nodes as circles and orbital rings as strokes, and supports mouseover highlighting and click interactions on ring groups.