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About ShadowCalc: Sun Shadow Length
ShadowCalc tells you how long a shadow an object will cast at a chosen place and UTC time.
Enter latitude, longitude, object height, and a UTC date and time. The app computes solar elevation and azimuth, then shadow length from height divided by the tangent of elevation. When the sun is below the horizon, the result is a clear No Shadow state — not a negative or infinite number.
