Stop guessing the tilt angle.
Calculate it from your coordinates.
Enter a site’s exact latitude and a target date — get the optimum panel tilt, peak sun hours, and the sun’s path across the array, in seconds.
Generic tilt charts assume a flat horizon. Your site isn’t flat.
A rooftop array with a parapet wall, a ground-mount system near a tree line, or a carport under a building’s shadow — all need the sun’s actual path on your actual date, not a regional average.
Optimum angle by latitude & season
Get the fixed-tilt angle for max annual yield, or the two-position seasonal adjustment for summer/winter optimization.
Sun path against obstructions
Plot solar altitude and azimuth hour-by-hour to identify exactly when a nearby structure clips array output.
Numbers you can put in a proposal
Peak sun hours, solar noon altitude, and azimuth range — the figures clients and permitting offices actually ask for.
Site coordinates + date
Lat/lon from address search or GPS. Any date, past or future.
Sun Position Calculator
Altitude, azimuth, sunrise/sunset, and solar noon — computed for that exact point on Earth.
Apply to your design
Read off tilt, peak sun hours, and the shadow window directly.
Location: 31.2304°N, 121.4737°E (Shanghai)
Date: 2026-06-21
Sunrise: 04:46 → Azimuth 060.8°
Solar noon: 11:55 → Altitude 81.4°
Sunset: 19:01 → Azimuth 299.2°
Day length: 14h 15m
Recommended tilt: 31° (fixed, annual optimum)
Run it for your own site coordinates
Free. No signup. Works for any location and date, past or future.
Open Sun Position Calculator →