The Druids chose the mid-autumn acronychal
(sunset) rising of the Pleiades, probably when the year's agriculture ended, to mark their New Year (a holiday that eventually transformed into Halloween).
In addition to the determination of the times of prayer, the direction of Mecca, and the first sighting of the lunar crescent, topics discussed in such works include the lunar mansions and heliacal risings and acronychal
settings of stars in relation to the seasons.
Byzantium offers a very interesting perspective over what could be the positive connotation of ideology and of the need for ideology in a society fully aware of the report between religion and power, between acronychal