O wow, one of my first expensive pieces of software I bought when I was young. Guide for DOS by ProjectPluto. I wanted to find out if the so called predicted Galactic Center conjunction with the winter solstice really took place in 2012 (as popularized by John Major Jenkins in Maya Cosmogenesis 2021).<p>It turned out it took place - according to the algorithms and ephemerids of Guide - in 1998 or 1999, depending on the arc second definition you use. Great software.