Trutine

Definition

Trutine is an older astrological term derived from a word meaning a balance or weighing instrument. It usually refers to the Trutine of Hermes, also called the Hermetic rule: a traditional calculation connecting the Moon’s position around conception with the Ascendant or Descendant at birth. It is primarily associated with birth-time rectification and prenatal astrology.

Astrological Meaning

In traditional practice, the Trutine proposes a reciprocal relationship between the conception chart and the natal chart. The Moon’s degree at the estimated conception may correspond to the natal Ascendant or Descendant, while the birth horizon can help refine the proposed conception time. Different versions of the method apply distinct rules according to the Moon’s phase, position above or below the horizon, and the estimated length of gestation. Because historical instructions and calculation methods vary, the Trutine is best understood as a specialized rectification technique rather than a single universally standardized formula. It does not function like a planet, sign, house, or aspect and is not interpreted as an independent personality factor.

Why It Matters

The Trutine matters mainly to astrologers researching an uncertain birth time or studying historical approaches to conception and birth. It illustrates how traditional astrology linked lunar cycles, gestation, and the natal horizon. Any result should be compared with documented life events and other rectification methods rather than treated as conclusive proof of an exact birth time.

Related Encyclopedia Entries

• Traditional Astrology
• Birth-Time Rectification
• Natal Chart
• Ascendant
• Descendant
• Prenatal Epoch