Your house's identity card: the sun from the exact spot

• The horizon, from 2 m above the ground, in 720 directions of 60 km, on the Copernicus GLO-30 model: within 3 km a point roughly every 30 m, beyond that a grid of 90 m that keeps the highest ridge.
• The sun, minute by minute through 2026 (NOAA algorithm): a minute counts when the top of the disc clears the ridge.
• The result: hours on 21 December, first and last ray, sunless days and days under three hours, the peak shading from the south, the chart. Beside it, the town's figures, which belong to the town, not the house.

The coarse grid errs, if at all, on the side of shade: in Claut the spot calculation at the town hall finds 15 sunless days, the town figure 14.

• Nearby trees and buildings. The terrain is cleared of anything narrower than about 150 m, so the block opposite or the neighbour's walnut tree casts no shade in the sum. Check those on site.
• Cloud. This is clear-sky sunshine, not a foggy December.
• The floor. The point sits at eye level in the garden, not on the third floor.
• The address. Our server looks it up on Photon, an address search engine built on OpenStreetMap data; only coordinates go on.

Sellers: December sunshine is what mountain buyers ask about first and hardly ever find written down.

Buyers: to compare two houses in one village before a viewing. Whole towns are in the sun tool and the guide winter sun.