What was the Great Chain of Being and how did it inform philosophy in the Middle Ages?

What was the Great Chain of Being and how did it inform philosophy in the Middle Ages? How was reality or being determined using it? How did this worldview support the idea of a geocentric universe?

What was the Great Chain of Being and how did it inform philosophy in the Middle Ages? How was reality or being determined using it? How did this worldview support the idea of a geocentric universe?