Chronomancy
, also known as hemerology or calendar astrology, is a generalized term for divination the determination of lucky and unlucky days and of the best time to do something, popular in ancient East Asia, particularly China. Practitioners would utilize calendars and other temporal data to determine the auspiciousness of future days.
The term "chronomancy", stemming from the Greek word chronos, and the word manteia is also used in fiction to refer to a school of magic involving supernatural manipulation of time.