👉 The term "Idesia" is used in the context of astrology, specifically in the Western Hemisphere. It refers to a period during which the Moon's phase appears as if it were opposite the Sun. This phenomenon occurs about every 12 years and can be observed from March 20th until May 20th. Idesia is significant for astrologers because it is associated with change, rebirth, and beginnings, mirroring the lunar phases of the year.