"Angles in code are usually not type-safe and converting units is done by multiplying by magic numbers. Inspired by the DateTime and TimeSpan framework types, I decided to create a type-safe library for angles. What it does Immutable double-precision angle that supports revolutions, radians, degrees, and gradians. My first implementation stores all the angles in radians. This is fine if these are to be used for trigonometry operations but, what if I want to store it in degrees and only operate in degrees? I refactored it all so that the angles are stored in the same unit they are created. Any conversion is explicit. This resulted in a lot of code but it's worth it."