SunPath methodology

SunPath uses deterministic solar-position calculations to estimate sun altitude, azimuth, daylight windows, shadows, and diagram data for architectural studies.

Current irradiance and report values are generated clear-sky estimates for early feasibility review, not measured weather-station data.

Solar geometry

NOAA-style calculations use solar declination, the equation of time and hour angle to estimate altitude, azimuth, sunrise, sunset and solar noon. Civil time depends on longitude, timezone and daylight-saving rules; solar noon need not be 12:00.

See NOAA Solar Calculation Details for background. This is not NOAA certification or an independent validation of SunPath.

Model and report assumptions

The site model uses geometric massing, footprints and direct-sun shadows on flat ground. Irradiance profiles are generated clear-sky estimates, not measured weather or annual energy. Latitude bands describe broad solar context and do not establish the local climate or heating/cooling demand.

Reports combine project-specific solar data with a separately labelled window-and-shading worked example. The example does not infer actual rooms or windows from the massing model. Project files use JSON; reports use HTML and can be saved as PDF through browser printing.

Planning limits

Direct-sun geometry does not determine diffuse or reflected daylight, glare, indoor temperature or code compliance. Verify glazing, reveals, neighbouring obstructions, weather, occupied hours and local requirements before using a suggestion in detailed design.

Read Designing Homes Around Sunlight for a practical introduction, or open SunPath to test your site.