Open-source interactive map for the Aug 12 total solar eclipse
- ID
- 12579
- Status
- summarized
- Published
- 09 Aug 2026, 3:38 AM
- Fetched
- 10 Aug 2026, 7:11 PM
- Provider
- Hacker News
- Category
- dev-community
- Original URL
- https://eclipsefan.org/?v=2&t=max&layers=eclipse%2Cbesselian%2Cumbra-live%2Cshadow-3d%2Ccloud-projection%2Cosm&lat=43.4623&lon=-3.8099&opacity=besselian%3A0.2%2Cumbra-live%3A0.2&zoom=6&palier=minute
- Source URL
- https://hnrss.org/best
Summary
- Score
- 3.5
- Created
- 10 Aug 2026, 7:11 PM
- Tags
- Audience
- developers
What happened
EclipseFan is an open-source interactive map tracking the August 12, 2026 total solar eclipse, with multilingual SEO support via Cloudflare's HTMLRewriter and layered map views including Besselian elements, umbra tracking, and cloud projections. The project notes reveal implementation details around HTMLRewriter's limitation that it can only rewrite existing elements, not create them, requiring all target tags to pre-exist in the HTML.
Why it matters
The HTMLRewriter constraint (rewrite-only, no element creation) is a concrete gotcha for anyone using Cloudflare Workers for SEO or i18n on edge-rendered pages — if you rely on it for hreflang or canonical tags, those tags must already exist in your HTML template. Beyond that, the project itself is a niche eclipse-tracking tool with little direct impact on most builders.
Discussion angle
The HTMLRewriter limitation is worth a quick mention for anyone doing edge-side SEO/i18n — but the eclipse map itself is mostly a curiosity for this audience.