Twenty-eight days prior to winter solstice, the large central light is split by the shadow of a strategically placed stone. The light becomes whole again twenty-eight days after winter solstice. This series of pictures was taken at solar noon.

The change in elevation of the sun at solar noon between 28 days prior to winter solstice and winter solstice is 3.5 degrees.

These pictures show approximately 28 days prior to winter solstice until approximately 28 days after