About
That Sky reconstructs photorealistic sky images for any date, time, and place in history — grounded in real meteorological data from open scientific archives.
Whether it's the sky over a city on the day you were born, the afternoon light above a stadium during a match you'll never forget, or a quiet morning somewhere you once called home — . We bring it back.that sky existed. We bring it back.
How it works
01
Weather data
We query Open-Meteo's ERA5 reanalysis archive — a global dataset of hourly atmospheric conditions going back to 1940. Cloud cover, temperature, wind, precipitation.
02
Sun position
We compute the exact altitude and azimuth of the sun for your location and time using astronomical calculations. This determines the light quality — golden hour, midday, dusk.
03
Image generation
The weather and light data is translated into a detailed prompt for a photorealistic AI image model. The result looks like a photograph taken at that moment.
04
Your sky
The generated image is branded with the location, date, and time — ready to download and keep.
Data source: Open-Meteo ERA5 reanalysis archive. Coverage: global, hourly, from 1940 to present. Spatial resolution: ~25km. Generated images are artistic reconstructions — not exact photographs.
Any day. Any place. The sky that was.
あの空に、もう一度会いに行く。