Calli's patron in the day sign count is Tepeyollotl, heart of the mountain, the jaguar aspect of Tezcatlipoca associated with caves and their echo, a deity whose underground, sheltering associations pair naturally with a sign already read for enclosure and the home. Its direction is west, the house of the setting sun, and as one of the four year bearers Calli specifically names the years of the western quarter across the fifty two year span of a full Calendar Round, the point at which the 260 day tonalpohualli and the 365 day xiuhpohualli, having drifted apart by one day sign each solar year, return together to their shared starting alignment.
The mechanics behind this are simple arithmetic: 365 exceeds an exact multiple of twenty by five, so each successive solar year opens on a day sign five places further around the twenty sign cycle than the year before, and because twenty divided by the shared factor of five yields four, only four day signs, spaced exactly five apart, ever recur as year openers, Calli, Tochtli, Acatl and Tecpatl. A Calli year, numbered anywhere from one to thirteen before the pattern repeats, was read by the tonalpouhque with the same domestic, sheltering character its ordinary day carries, a household focus extended across an entire year rather than a single date.