What is "realsky"

RealSky is the name of a commercially available, digital photographic sky atlas. It is a subset of the Digitized Sky Survey (DSS) and was published in 1996 by the Astronomical Society of the Pacific.

RealSky is composed of the "RealSky" product, covering the northern sky, and "RealSky South," published slightly later and covering the southern sky. RealSky is on nine CD-ROMs (eight data discs and one software disc), and RealSky South uses 11 CD-ROMs (ten data discs and one software disc).