The Muuly-Barsh projection was an estimate of the date of the first habitation of a planet.

According to the projection, Rigel IV was first inhabited approximately one billion years ago (circa 999,998,000 BCE, reference stardate −10,000,000/00) (FASA RPG module: The Orions: Book of Common Knowledge). This was by an advanced space-faring race known as the Shour (FASA RPG module: The Orions: Book of Deep Knowledge).