This animation demonstrates a stylized sunrise and sunset cycle over a two-layer mountain landscape. An SVG `circle` for the sun moves vertically while a `radialGradient` sky background and `linearGradient` landmasses, defined using `stop` elements, synchronize their color shifts through SVG’s `<animate>` tag. The landscape is constructed with cubic and quadratic Bézier curves using the `path` element’s `d` attribute, and the code relies entirely on native SVG and SMIL animation.