A kalandologion (Greek καλανδολόγιον, 'almanac';[1] plural kalandologia) is a type of omen text that purports to predict the effects of the beginning of the year falling on a certain day of the week or in a certain sign of the zodiac.
[4] John of Nikiu, writing in Egypt in the sixth century, attests that many Christians used a kalandologion attributed to Ezra.
[3] In his Canons, written early in the eighth century, Patriarch Nikephoros I of Constantinople condemns their use, calling them "unclean".
[5] Several Coptic kalandologia include a second part that makes predictions based on the strength and direction of the wind in the week of the sixth of Ṭūba.
590 is of the latter type, for example: If the east wind comes on 8 Tubi, there will be a great winter, the weather will be good, the cattle will miscarry, the wheat will become as dry as cumin, the men will suffer severe illnesses, and the children will die.