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.<p>Source code and additional information is available on GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;dnlzro&#x2F;horizon" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;dnlzro&#x2F;horizon</a><p>[1] <a href="https:&#x2F;&#x2F;html.energy&#x2F;html-day&#x2F;2025&#x2F;index.html" rel="nofollow">https:&#x2F;&#x2F;html.energy&#x2F;html-day&#x2F;2025&#x2F;index.html</a>

Show HN: The current sky at your approximate location, as a CSS gradient

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