Within the years, liminal times include equinoxes when day and night have equal length, and solstices, when the increase of day or night shifts over to its decrease. This "qualitative bounding of quantitatively unbounded phenomena" marks the cyclical changes of seasons throughout the year. Where the quarter days are held to mark the change in seasons, they also are liminal times. New Year's Day, whatever its connection or lack of one to the astrological sky, is a liminal time. Customs such as fortune-telling take advantage of this liminal state. In a number of cultures, actions and events on the first day of the year can determine the year, leading to such beliefs as first-foot. Many cultures regard it as a time especially prone to hauntings by ghosts—liminal beings, neither alive nor dead.