Solar Geometry & Radiation Calculators

We offer three simple tools for calculating or looking up basic solar angles and radiation values. These angles and values are used when designing solar control (shading) devices.

PEC Sun Angle Chart
This graphical sun angle chart provides altitude and profile angles for any latitude. It is available for free while supplies last from the PEC. It is also available for short-term loan from the Tool Lending Library. To request one, please email pecarchitecture@pge.com. (Note: The Sun Angle Chart can only be mailed to addresses within California.)
Pilkington Sun Angle Calculator (PSAC)
The PSAC provides basic solar angles including profile angle, solar surface azimuth, altitude, and angle of incidence. This calculator is available for purchase from the Society of Building Science Educators and is available for short-term loan from the Tool Lending Library. (Note: The Sun Angle Calculator can only be mailed to addresses within California.)
Architect's View of the Sun spreadsheet
This Excel spreadsheet provides solar geometry angles and radiation values. The use provides information such as window orientation, latitude, surface tilt angle, and radiation. There are two versions of this spreadsheet. AVOTS_Annual.xls (XLS, 50 KB) displays one variable for all times of day for the 12 months of the year. AVOTS_Monthly.xls (XLS, 36 KB) displays all variables for one month month.