Learn to Play
The best place to start your Codex Astronomica adventure is the interactive demo - a step-by-step tutorial that teaches you the game without any need to craft the cards or print anything more than the demo itself. Head over to the downloads page to get started!
On the same page, you'll find a downloadable/printable rulebook, various challenge scenarios as well as night skies for free play, and all required print-and-play components!
Of course, both a video tutorial and the rulebook itself can be seen here as well.