I just returned from watching an amazing show at Miantonomi's Cave this afternoon, on the date of the Native American Green Corn Festival. This show was performed by moving sun daggers, and I will display the highlights.
The last entry about this site was Summer solstice. The cave was full of light at 7:26 and dark at 7:36. However, the wall behind the large boulder was in sunlight almost until sunset, so I assumed this was the correct solstice marker. This evening, the 318 degree bearing of the boulder blocked out most of the sun, leaving a small patch visible at 7:16.