ruby-sphere-0.2.0 released

ruby-sphere is an application to calculate apparent positions of stars with a moderate accuracy. We are pleased to announce the second alpha release, ruby-sphere-0.2.0, including a command. You can now edit a simple text file to plot your visibility map.

The goal of ruby-sphere is to to provide an easy way to plan astronomical observations. Ruby version 1.8.x is required. Gnuplot is required to plot visibility maps.