Window Shading Calculator
Compute the exact overhang depth needed for perfect solar shading using trigonometry. Powered by real-time geocoding & pure math — zero external APIs.
Architectural Shading
Required Overhang Depth
—Accurate Window Shading & Overhang Calculator
Frequently Asked Questions
Everything you need to know about the technical implementation, security, and usage limits of this tool.
It uses Cooper's solar declination equation combined with the standard spherical trigonometry formula: sin(α) = sin(φ)·sin(δ) + cos(φ)·cos(δ)·cos(ω). The calculation assumes solar noon (ω = 0) which gives the peak altitude — the industry standard for architectural shading design.
The location search uses the free OpenStreetMap Nominatim API (no key needed). Once coordinates are resolved, the solar angle and overhang depth are computed 100% locally in your browser using pure trigonometry — no data leaves your machine.
Solar noon represents the highest sun altitude of the day. Architects design overhangs for this peak condition to ensure maximum shading coverage. This is the accepted standard in passive solar design and ASHRAE guidelines.