Original: Brophy's hypothesis proposes first that the southerly line of three stones inside the calendar circle represented the three stars of Orion’s Belt and the other three stones inside the calendar circle represented the shoulders and head stars of Orion as they appeared in the sky.
Simplified: Brophy's theory proposes first that three of the center stones match the belt of Orion at its minimum tilt and the other three match the shoulder and head stars of Orion at their maximum tilt.