"In 1951, Libbey-Owens-Ford introduced the first Sun Angle Calculator. It was developed with the help of architects and engineers to provide a relatively simple method of determining solar angular values for architectural purposes. The Calculator proved to be quick and accurate in its instruction. The fundamentals of the Sun Angle Calculator remain a very useful tool today. Because of new products and technology, LOF has prepared this completely updated edition of the Calculator as a service to the architectural and engineering professions."
