Three or more planets in one sign or house stop being separate voices and become a chord. This calculator finds your clusters — by sign and by house, in both Tropical and True Sidereal — inside your full chart.
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A stellium concentrates the chart's weight. Three planets in Virgo lean everything toward precision; three in the 10th house put unusual gravity on work and public life. It's the difference between a sign being present and a sign running the show.
And because sign boundaries move between zodiacs, a stellium can exist in Tropical and dissolve in True Sidereal — or appear only there. Checking both is the honest way to know whether your cluster is a fact of the sky or an artifact of one measuring system.
A cluster of three or more planets in the same sign or house — enough concentration that the sign or house stops being one note among many and becomes a dominant chord in the chart.
Most astrologers say three or more in the same sign or house; some hold out for four, especially when the cluster includes slow outer planets that whole generations share. This calculator flags clusters of three and up, and you can judge the weight yourself.
A sign stellium colors how a chart expresses (three planets in Virgo lean everything precise); a house stellium concentrates where the energy goes (three planets in the 10th put unusual weight on work and public life). House stelliums need a birth time to compute.
Yes. The full result — stelliums by sign and house in both zodiacs, plus the complete chart — is free, with no account or payment needed.