Kernrechtsfrage
Whether the municipality's autonomy was violated by the cantonal court's interpretation of Art. 26 BauG on minimum sunlight duration.
Extrahierter Entscheid
No violation: the cantonal court did not act unconstitutionally when it rejected a purely theoretical horizon and required the actual shadow situation to be considered.
Extrahierte Begründung
The municipality may regulate building law autonomously, but cantonal review may correct an unlawful legal interpretation. Art. 26 BauG allows alternative calculation methods; using a theoretical horizon to grant setback privileges despite worse actual conditions would empty the norm and distort the setback regime.