Observed arrival · 2026-10-13
Henge Days: a calendar for sunlit walls
Henge Days calculates when sunlight will hit a building’s walls head-on, and can map the light along a chosen street.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Photographers, filmmakers, muralists, and architects
- Worth noticing
- Its light categories use explicit elevation cutoffs: henge below 1.5°, golden below 6°, and low sun below 15°.
Field notes
The calculator uses building footprints from OpenStreetMap and compares each wall’s bearing with the sun’s position across the coming year. It separates horizon-level “henge” light (under 1.5°) from golden light (under 6°) and low sun (under 15°), then presents dates and times; the route examples order lit façades along a street. The page also describes a planner with stand points, arrive-by times, cloud forecasts, and a calendar feed.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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