In addition to 28 niches, there are six larger and less regularly spaced wall crypts. During the summer solstice sunrise, a beam of light enters a northeastern opening in the kiva and settles into one of these irregular niches. It is an event which today attracts many spectators, but it may not have been visible or significant during the 11th century. aztecnm.com/aztec/r ... html to see pictures of a restored kiva (lower right pics)

chacoarchive.org/cr ... ada/