Planetary and stellar configurations exert physical influences that can cause disease and should guide medical diagnosis, prognosis, and treatment.

Medical astrology was not the medieval equivalent of reading a horoscope column.

In late-medieval and early-modern European universities, astronomy and astrology belonged to learned mathematical culture and were deeply entangled with medicine. Ptolemy’s astrological framework held that heavenly bodies exerted physical influences on the terrestrial world. Combined with Galenic humoral medicine, planetary qualities such as heat, cold, moisture, and dryness could be mapped onto bodies and diseases.

Physicians used natal charts to assess predisposition, zodiacal diagrams to relate body regions to signs, and planetary timing to decide when to bleed or administer medicines. Astrological configurations were also used to forecast epidemics. These were attempts at causal and predictive medicine using the best astronomical calculations available.

The boundary did not disappear suddenly with the Scientific Revolution. After 1700, astrology lost much of its former prestige in medical circles, yet respected physicians continued to investigate whether the Moon or planets correlated with fevers and other diseases. Some gathered statistics and framed the question in explicitly empirical terms.

As medicine acquired stronger causal tools, including pathological anatomy, physiology, chemistry, germ theory, epidemiology, and genetics, the celestial framework lost explanatory value.

The card is deliberately scoped to learned medical astrology, not modern popular astrology, and its long gradual decline makes an exact lifespan misleading.