Google's existing 3D building mesh plus solar azimuth math generates shadow profiles for any city on Earth. This demo does it with 21 buildings; Maps could do it with all of them.
Nests beside Transit, Traffic and Satellite in the Layers menu. Lights up exactly when high-intent seasonal queries spike: “patios near me.”
Restaurants sponsor their pin precisely for the hours their patio shifts into prime sun — the first ad unit priced by sunlight.