The Planetarium is one of those very useful tools for a GM with a thousand things to do everyday. It provides a concise background to every system in the Miran Chain, famous for Zalos, Odacon and of course Mira itself, but with many poorly or nor described at all systems. For a party who have an exploration or mercantile bent this resource allows the gm to quickly describe entire systems in some detail and gives a number of launching points for the imagination of flower and grow. Each planet in every system has a small image, each system is visualised by sun allowing you to accurately depict the entire system in a moment. All of the information could be provided to the players ahead of time (except for the story leads embedded in system description), giving the party access to plot their own path for a more freeform style game.

Overall a really good product and a great companion for the Coriolis Atlas (especially the community sourced one) filling in all of the detail of the less well understood systems.