Plants state which spheres they align with in the book of Judgement.
The information will return to the glossary entry later, once elemental
symbols are available.

The old cycle of 12 seasons - Minquesta, Ohta, et c., came from a
solar-system model which had some problems.  The new one should be
faithful to how a roughly Earth-sized moon revolves around a Sun.

In the new model, Fenestra travels around the Ainumar every 60 days.
Each revolution is a 'cycle', and six cycles makes a year.