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I had this idea 8 years ago during a busy winter in Vienna, Austria where I couldn’t see the Sun for two consecutive weeks (buildings are rather high and streets narrow). I just wanted to know where I could spend lunch break in the Sun. Eventually started programming it around 2 years ago.

It’s a web-app based on three.js. Think of Google Earth enhanced by time based solar shadows. While there is global terrain coverage, buildings are currently limited to Vienna but we’re working on global coverage as well.