A stellium gives its house or sign a particular emphasis, indicated by nature of the planets themselves, as well as the house and sign position of the planets concerned. The planets involved have a reciprocal effect on each other, and whether or not they support each other depends on which energies they symbolise. For example, a stellium involving Venus, Mercury, and Neptune might give a rich imagination. A stellium involving Mars, Saturn, and Pluto might be more stressful for the individual to handle, as Mars urges aggressive action, Saturn symbolizes restraint, and Pluto can be either the ruthless bully or profoundly transformative experiences.
A stellium is also a powerful focal point in a chart because its house or sign contains a concentration of several house rulers. The planetary ruler of the sign on a house cusp has considerable influence on the affairs of that house, according to its own position and aspects with other planets. Where multiple house rulers are found in a stellium, their sign or house takes on particular influence in the affairs of the houses over which the stellium planets rule.
- Transits to Stelliums and the Recurring Story Arcs They Trigger (Donna Cunningham, 2014)
- Stelliums (Planetary Aspect Patterns by Peter Meyer)
- Donna Cunningham: The Stellium Handbook. E-book, 2013. Excerpts
- Founder of the American Red Cross. Barton had a stellium in the tenth house and in Capricorn. At a time when few American women held responsible positions, she was known as a focused and hard-working administrator.