Rapid Method for Predicting the Distribution of Daylight in Buildings by Waclaw Turner-Szymanowski presents the protractor method based on Higbie and Levin’s analytical formula for predicting daylight in buildings. This book simplies its application to solve complex problems using developed charts. The contents include sections on general treatment of obstructions and reflections, correction for losses in window glass, and various applications of the protractor method to different building types. This method aims to provide architects and engineers with a simple, rapid, and accurate tool for calculating daylight, addressing a need long neglected in building design. The historical literature review highlights contributions by Continental investigators and critiques their methods, emphasizing the utility and precision of the Higbie-Levin formula in daylighting predictions. The bulletin proposes that point-by-point computations using this method can accurately account for all obstructions and reflections, offering a practical solution to daylighting challenges in architectural planning.