In the 1960s, a new theory surfaced that claimed Stonehenge was the work of ancient astronomers, and that its giant stone pillars were used to predict eclipses of the moon and sun. But was there anything to the idea? To find out, we talked to NOVA's senior science editor, Evan Hadingham. He trained as an archeologist and has written two books on Stonehenge. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. Learn what motivated the builders of Stonehenge at pbs.org/nova/ancientworlds