A minimalist sunrise-and-sunset scene animates continuously in pure SVG. A radial sky gradient shifts from aliceblue to indigo, while two layered landscape paths alternate their linear gradient stops over a 15-second cycle. The sun, a circle, moves vertically via an `<animate>` element on its `cy` attribute. No JavaScript libraries are used; the visualization relies entirely on native SVG SMIL animations and gradient definitions, with styling handled by a linked stylesheet.