Editing Window (section)

=== Sun incidence angle ===

Historically, windows are designed with surfaces parallel to vertical building walls. Such a design allows considerable solar light and heat penetration due to the most commonly occurring incidence of sun angles. In [[passive solar building design]], an extended [[eave]] is typically used to control the amount of solar light and heat entering the window(s).

An alternative method is to calculate an optimum window mounting angle that accounts for summer sun load minimization, with consideration of actual latitude of the building. This process has been implemented, for example, in the [[Dakin Building]] in [[Brisbane, California]]—in which most of the fenestration is designed to reflect summer heat load and help prevent summer interior [[over-illumination]] and glare, by canting windows to nearly a 45 degree angle.