Progress in Understanding the Diffuse UV Background

The ultraviolet spectrometers aboard the Voyager spacecraft have been used to delineate, for the first time, the appearance of the diffuse component of the sky at wavelengths about 1000 Å to 1100 Å. To measure the diffuse background requires use of appropriate instrumentation. I explain how difficult it has been to ensure that investigation of the UV diffuse background radiation is carried out with instrumentation that is, in fact, capable of making the necessary measurements successfully.