The current sky at your approximate location, as a CSS gradient
For HTML Day 2025 [1], I made a web service that displays the current sky at your approximate location as a CSS gradient. Colours are simulated on-demand using atmospheric absorption and scattering coefficients. Updates every minute, without the use of client-side JavaScript. Source code and additional information is available on GitHub: https://github.com/dnlzro/horizon [1] https://html.energy/html-day/2025/index.html
In plain words
A web service that generates a CSS gradient representation of the current sky at the user's approximate location. The service simulates sky colors using atmospheric absorption and scattering coefficients, updating every minute without requiring client-side JavaScript. Built for HTML Day 2025, it provides an accurate visual representation of atmospheric conditions based on location data, allowing developers to embed realistic sky gradients into web projects.
written from the facts on this page · September 2026
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