👉 Trienniality is a term used in the context of astronomy and astrology to denote the occurrence of an event or cycle that occurs every 3 years. It refers to the period between two new moons, which are typically seen as the end of a lunar cycle and the beginning of a solar cycle. This means that each year has two full moons (the first and last) and one half moon, with the second half moon occurring in February or March.
