Anna Sofaer found the now-famous "Sun Dagger" petroglyph site on a desert butte high above Chaco Culture National Historical Park at Summer Solstice in 1977, leading to 30 years research into the meaning of ancient Chaco's astronomical expressions. Chaco Astronomy brings together all the major findings of Solstice Project's many researchers, changing forever the understanding of a place often called "America's Stonehenge" Nine revealing chapters explore...