Neomenium

Definition

Neomenium is an older term for the New Moon or the beginning of a lunar month. It derives from Greek language associated with the “new month.” Historical usage varies: it may indicate the astronomical conjunction of the Sun and Moon, when they share the same zodiacal longitude, or the first visible lunar crescent that follows conjunction. The intended meaning therefore depends on the calendar and astrological tradition being consulted.

Astrological Meaning

In astrology, the neomenium marks the opening of a lunation cycle. A chart cast for the exact Sun–Moon conjunction is interpreted as a symbolic outline for themes developing until the next New Moon, with particular attention often given to its zodiac sign, house placement, aspects, and local angles. Traditional practitioners may also examine the first crescent or use the lunation in mundane, electional, and natal work. When a neomenium closely contacts a natal planet or angle, it may emphasize matters associated with that point, though the wider chart and current transits shape how this emphasis is expressed.

Why It Matters

Understanding this term helps readers interpret older astrological texts without assuming that every reference uses the same definition of “New Moon.” Distinguishing exact conjunction from first visibility is especially important when calculating charts or comparing traditions. The neomenium also provides a practical timing framework for observing beginnings, setting intentions, and tracking how a monthly theme develops, without treating the lunation as a fixed prediction.

Related Encyclopedia Entries

• Traditional Astrology
• Astrological Terminology
• Natal Chart
• New Moon
• Lunar Phases
• Electional Astrology