Stellium
Three or more planets clustered in one sign or house - concentrated energy.
A stellium is a powerful concentration of planetary energy in one area of your chart. Most astrologers define it as 3+ planets in the same sign or house (some require 4+). This creates an intense focus in that life area - it becomes a major theme you can't ignore. The sign or house containing the stellium often dominates your personality or life experience.
Example
A stellium in the 7th house suggests relationships are a central theme, with many planets coloring how you partner.
Cultural Context
Stelliums gained prominence in modern astrology as planets began clustering during rare configurations. Major historical events often coincide with planetary stelliums in specific signs — for example, the 1960s Virgo stellium correlated with the health food movement, environmental awareness, and detailed social analysis.
Famous Example
Prince has a legendary Gemini stellium (Sun, Mercury, Venus, and sometimes Moon depending on time) giving him extraordinary versatility and communication ability. His ability to master multiple instruments, blend genres, and reinvent himself repeatedly demonstrates stellium concentration.
Did You Know?
The debate about what 'counts' as a stellium is ongoing. Some astrologers require 4+ planets; others accept 3+. Most exclude points like the Nodes or Ascendant; some include them. What's agreed: if you have a cluster, you feel it — that sign or house demands attention.