Sesquiquintile

Definition

A sesquiquintile is a minor astrological aspect formed when two planets or chart points are approximately 108 degrees apart. Its name means one and a half quintiles, since a quintile measures 72 degrees. It is also sometimes called a tridecile. Astrologers generally use a narrow orb, often about one to two degrees.

Astrological Meaning

The sesquiquintile is commonly associated with the quintile family’s themes of creativity, technique, pattern recognition, and purposeful use of talent. The 108-degree angle may suggest an ability that develops through refinement rather than emerging effortlessly. The planets involved describe what functions are being combined: for example, Mercury and Venus could link communication with aesthetic judgment, while Mars and Saturn might emphasize disciplined action or technical control. The houses show where this pattern is most likely to operate, and the signs describe its style of expression.

Why It Matters

Because it is a minor aspect, the sesquiquintile usually adds nuance rather than dominating a chart. It becomes more significant when exact, repeated, connected to the Sun, Moon, Ascendant, or chart ruler, or supported by other aspects. Recognizing it can help identify specialized abilities and persistent creative adjustments that major aspects alone may not fully explain.

Related Encyclopedia Entries

• Quintile
• Biquintile
• Minor Aspects
• Aspect Orb
• Natal Chart