There is an entire field of archeology that studies the history of how people studied the skies and the tools that they used. This field of study is called archaeoastronomy. In addition to studying the techniques that these ancient cultures used to study astronomy, archaeoastronomy examines the structures and tools that were used in these pursuits.
Here is your chance to practice a little archaeoastronomy. Take a moment to look at the image shown here. How do you think it was used? Who do you think invented it? Once you have considered these questions for a few moments, roll your cursor over the image to reveal the answer.