The peculiar spacing of the megaliths in the circle also fascinates scholars. Some think that the builders of Stonehenge used the spacing in the circle to predict solar and lunar eclipses by calculating the angles of the light. Other scientists theorize that Stonehenge was used as an observatory of sorts,to observe the phases of the moon.Is it possible that such wise and knowledgeable people lived 5000 years ago?Were they the first true astronomers? If they knew so much about the stars and planets, why were their building techniques so primitive, so simple? What did they use to move the stones to Salisbury Plain from the quarry? What did they use as tools to build these structures? The answers to these questions keep scientists searching.Perhaps there is much more for modern society to learn from these seemingly crude and simple structures.