fresh block
A rotating world map displays continents in a continuous spin. Using D3.js v4, the visualization loads GeoJSON country boundaries and applies an orthographic projection. The code sets up an SVG canvas and employs `d3.geoOrthographic` and `d3.geoPath` to render the geographic shapes. A timer-driven animation updates the projection's rotation along the X-axis, causing the globe to turn smoothly. The map's data originates from a remote GeoJSON source provided in the code, and the frame is rendered dynamically as an SVG path that updates each tick.