This animated SVG scene depicts a stylized sunrise and sunset over a layered landscape. It uses an HTML `<svg>` element with CSS gradients and SVG `<animate>` tags to cycle the sky from aliceblue to indigo, move the sun downward, and shift the horizon colors over a 15-second loop. The two overlapping landscape paths use quadratic and cubic Bézier curves, filled with `radialGradient` and `linearGradient` definitions. All rendering is done directly through the SVG API, with no external JavaScript libraries.