The Sun Problem, also known as the GLARE Problem, is a phenomenon that occurs when the sun's rays are reflected off of a surface and cause a GLARE that can be blinding or uncomfortable. This can be a problem for drivers, pilots, and other people who need to be able to see clearly in order to do their jobs safely. The term 'GLARE' is used to describe this phenomenon because it is caused by the reflection of light from a bright source, such as the sun.