For the Hopi people, the San Francisco Peaks are associated with the intercardinal direction southwest. They constitute ritually pure sacred spaces, and are used as sources for ceremonial objects.: The alignment of the sunset from the peaks to Hopi villages on Black Mesa is used to calculate the winter solstice, signifying the beginning of a new year, with a new planting season and new life. The peaks are seen as the home of the katsinam or kachina spirits, ancestors who have become clouds following their death. Katsinam are invited to Hopi villages to serve as ethical and spiritual guides to the Hopi community from midwinter to midsummer. Aaloosaktukwi or Humphrey's Peak holds particular religious significance and is associated with the deity Aaloosaka, a symbol of the Two-Horn Society, a religious group among the Hopi dating to the occupation of the Awat'ovi village on Antelope Mesa. Depiction of the peaks in association with calendar-keeping is attested in a kiva at the Hisatsinom settlement of Homol'ovi, which was occupied from 1250 to 1425; katsinam imagery dates to the 13th century as well.: Other Native American peoples also relate kachina spirits to heavy snowfalls on the peaks.