Marion arranged for the archaeo-astronomer, Victor Segovia (center left, white shirt), to demonstrate this effect at the House of the Governor during the solstice sunrise of June 21, 1995.
Ankle deep in bat guano, we enjoyed sunrise from the central rear room of the House of the Governor on the summer solstice of June 21, 1995.
The sun shines through the door to the right of the central doorway on the summer solstice and illuminates the rear chamber wall. On the equinox it shines through the central doorway, and on the winter solstice, through the door to the left of the central doorway.
Another of Victor Segovia's many contributions to the archaeology of the region was written up in the ArtTrak Blog on May 4, 2019.