Constructing Woodhenge painting by Lloyd K. Townsend

There were five versions of an ancient circular sun-calendar on the site (an original and four modifications), used to determine the changing seasons and ceremonial dates. Each circle had a different diameter and number of large, evenly-spaced red cedar posts. They were constructed from AD 1100-1200, and were an impressive example of science and engineering. The reconstructed Woodhenge on the site today, represents the third construction with 48 posts and a large central observation post. Certain posts align with the rising sun at the Spring and Fall equinoxes and the Winter and Summer solstices.