I know there are no months in Zeitgeist and the passage of time is measured by seasons. Does each season have a fixed amount of days within it? Are some seasons longer in a particular year?
So the full moon always lands on the 14th to 16th, the 34th to the 36th, and the 64th to the 66th.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.