Tag Archives: John Cooper

The Beheading of Jerome Cardan’s Son

The Italian astrologer Jerome Cardan (1501 – 1576), aka Gerolamo Cardano, was one of the greatest mathematicians of the Renaissance. Because he was often short on cash, he developed probability theory to help him win at gambling. Cardan was born … Continue reading

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Why are Placidus Houses so Popular?

Recently I watched a YouTube video about house systems in astrology. This otherwise helpful video on astrological house systems contains a glaring error. The idea that Placidus became popular in the West only because tables of Placidus houses were so … Continue reading

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Reflections on Secondary Progressions

Secondary progressions are one of the most commonly used predictive techniques in modern astrology.  They are often attributed to the 17th century monk Placidus de Titus but their origin dates back at least as far as Vettius Valens in the … Continue reading

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