An anthropologist was working on an archeological dig of an ancient village in a Central American country. Near the ancient village, she discovered a large circle of rocks, with larger four larger rocks carefully placed on the northern, southern, eastern, and western sides of the circle. She also found four rectangular-shaped rocks placed at other points around the circle. After a survey, the anthropologists learned that the center of the circle and the rectangular-shaped rocks were aligned with rising and setting sun on the summer solstice and with the rising and setting sun on the winter solstice. Based on this information, the anthropologist concluded, “This ancient society worshipped the sun.” What assumption does this conclusion require?