This example shows a continuously spinning orthographic globe, with country borders rendered as white outlines against a graticule grid and a sphere outline. The rotation updates its longitude coordinate in each animation frame via `requestAnimationFrame`, while the map is drawn using `d3.geoOrthographic`, `d3.geoPath`, and `d3.geoGraticule`. Geographic data comes from a TopoJSON world atlas fetched at runtime, processed with `topojson-client`.