Tetragon

Definition

Tetragon is a classical astrological term for the square aspect, formed when two planets or chart points are approximately 90 degrees apart. The word comes from Greek terminology associated with a four-sided figure. In traditional aspect doctrine, planets in signs three signs apart were considered configured by tetragon, although exact degree relationships and allowable orb could refine the judgment.

Astrological Meaning

The tetragon generally signifies tension, friction, or circumstances requiring effort. Because the planets involved pursue their functions from signs that may share the same modality but differ in element, their aims can conflict even when both are strongly motivated. Interpretation depends on the planets, signs, houses, dignity, sect, and whether the aspect is applying or separating. Benefic planets may make the challenge more manageable, while difficult planetary conditions can intensify pressure. A tetragon does not automatically indicate misfortune; it can describe persistence, decisive action, and growth through confronting obstacles.

Why It Matters

Recognizing tetragon as the traditional name for a square helps readers understand older astrological texts and techniques. In a natal chart, it identifies areas where competing needs call for skill and adjustment. In transit work or synastry, the term still refers to the aspect itself, while the planets and chart context determine how that tension may be experienced.

Related Encyclopedia Entries

• Traditional Astrology
• Astrological Aspects
• Square Aspect
• Natal Chart
• Planetary Dignity